HASUO Masahiro

J-GLOBAL         Last updated: May 23, 2018 at 16:43
 
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Name
HASUO Masahiro
Affiliation
Kyoto University
Section
Graduate School of Engineering, Department of Mechanical Engineering and Science, Graduate School of Engineering Department of Mechanical Engineering and Science
Job title
Professor,Professor
Degree
Master of Engineering(Kyoto University), Doctor of Science(The University of Tokyo)

Research Interests

 
 

Research Areas

 
 

Academic & Professional Experience

 
1989
 - 
1997
The University of Tokyo, Research assistant
 
1997
 - 
2007
Kyoto University, Associate Professor
 
2007
   
 
- Kyoto University, Professor
 

Education

 
 
 - 
1988
Graduate School, Division of Engineering, Kyoto University
 
 
 - 
1986
Faculty of Engineering, Kyoto University
 

Published Papers

 
Keisuke Ueno, Kenta Kamebuchi, Jiro Kakutani, Leo Matsuoka, Shinichi Namba, Keisuke Fujii, Taiichi Shikama, Masahiro Hasuo
Japanese Journal of Applied Physics   57    Jan 2018
© 2018 The Japan Society of Applied Physics. We generated a 0.3-mm-diameter DC, hollow-cathode helium discharge in a gas pressure range of 10-80 kPa. In discharge plasmas, we measured position-dependent laser absorption spectra for helium 2 3 S 1 ...
Akira Ueda, Taiichi Shikama, Tatsuya Teramoto, Takanori Higashi, Yohei Iida, Masahiro Hasuo
Applied Physics Letters   111    Aug 2017
© 2017 Author(s). For an electron cyclotron resonance (ECR) discharge, a simple cusp field can improve electron confinement and enhance the degree of ionization (DOI) without sacrificing accessibility to the plasma. In this study, the spatial dist...
Keisuke Fujii, Daiji Kato, Daiji Kato, Nobuyuki Nakamura, Motoshi Goto, Motoshi Goto, Shigeru Morita, Shigeru Morita, Masahiro Hasuo
Journal of Physics B: Atomic, Molecular and Optical Physics   50    Feb 2017
© 2017 IOP Publishing Ltd. Based on the electron temperature (T e ) dependence of 20 forbidden tungsten line intensities observed in several Large Helical Device discharges, we experimentally evaluated fractional abundance profiles for highly cha...
Takanori Higashi, Taiichi Shikama, Tatsuya Teramoto, Akira Ueda, Masahiro Hasuo
Japanese Journal of Applied Physics   56    Jan 2017
© 2017 The Japan Society of Applied Physics. The magnitude and direction of linear polarization in the HeI 2 1 P-3 1 D emission line are simultaneously measured using a beam-splitting-type polarization spectroscopy system. The polarization measure...
Keisuke Fujii, Ichihiro Yamada, Masahiro Hasuo
Review of Scientific Instruments   88    Jan 2017
© 2017 Author(s). We developed a method to infer the calibration parameters of multichannel measurement systems, such as channel variations of sensitivity and noise amplitude, from experimental data. We regard such uncertainties of the calibration...
Kenji Yasui, Taiichi Shikama, Takanori Higashi, Masahiro Hasuo
Review of Scientific Instruments   87    Oct 2016
� 2016 Author(s). A system to measure linear polarization in the HeI 2 1 P-3 1 D emission line (667.8 nm) was developed for application to plasma polarization spectroscopy. To verify the system performance, the normalized Stokes parameters were ...
Keisuke Fujii, Motoshi Goto, Shigeru Morita, Masahiro Hasuo
Fusion Science and Technology   69 514-525   Apr 2016
The Balmer-α line profile observed from high-temperature magnetized plasmas can be interpreted as the sum of narrow and broad components corresponding to the emission from atoms generated in edge and core regions, respectively. The inversion of th...
T. Shikama, S. Ogane, Y. Iida, M. Hasuo
Journal of Physics D: Applied Physics   49    Dec 2015
© 2016 IOP Publishing Ltd. In helium discharge plasmas, the relative emission intensities of the fine-structure transitions belonging to the HeI 2 3 S-2 3 P transition can be affected by radiation reabsorption. Since the magnitude of the reabsorpt...
M. Shinohara, K. Fujii, D. Kato, D. Kato, N. Nakamura, M. Goto, M. Goto, S. Morita, S. Morita, M. Hasuo
Physica Scripta   90    Nov 2015
© 2015 The Royal Swedish Academy of Sciences. We found 12 unknown visible emission lines from the core plasma of large helical device with highly charged tungsten ions accumulated. The observation was made with our home-built échelle spectrometer,...
K. Fujii, Y. Takahashi, Y. Nakai, D. Kato, D. Kato, M. Goto, M. Goto, S. Morita, S. Morita, M. Hasuo
Physica Scripta   90    Nov 2015
© 2015 The Royal Swedish Academy of Sciences. We demonstrated a polarization-resolved high resolution spectroscopy of a visible emission line of highly charged tungsten ions (λ 0 = 668.899 nm, Shinohara et al Phys. Scr. 90 125402) for the large h...
S. Ogane, T. Shikama, H. Zushi, M. Hasuo
Review of Scientific Instruments   86    Oct 2015
© 2015 AIP Publishing LLC. In magnetically confined torus plasmas, the local emission intensity, temperature, and flow velocity of atoms in the inboard and outboard scrape-off layers can be separately measured by a passive emission spectroscopy as...
K. Ida, K. Ida, K. Nagaoka, K. Nagaoka, S. Inagaki, H. Kasahara, T. Evans, M. Yoshinuma, M. Yoshinuma, K. Kamiya, S. Ohdach, S. Ohdach, M. Osakabe, M. Kobayashi, M. Kobayashi, S. Sudo, S. Sudo, K. Itoh, T. Akiyama, M. Emoto, A. Dinklage, X. Du, K. Fujii, M. Goto, M. Goto, T. Goto, M. Hasuo, C. Hidalgo, K. Ichiguchi, A. Ishizawa, A. Ishizawa, M. Jakubowski, G. Kawamura, D. Kato, D. Kato, S. Morita, S. Morita, K. Mukai, I. Murakami, S. Murakami, Y. Narushima, Y. Narushima, M. Nunami, M. Nunami, N. Ohno, N. Pablant, S. Sakakibara, S. Sakakibara, T. Seki, T. Shimozuma, M. Shoji, K. Tanaka, T. Tokuzawa, Y. Todo, Y. Todo, H. Wang, M. Yokoyama, M. Yokoyama, H. Yamada, H. Yamada, Y. Takeiri, Y. Takeiri, T. Mutoh, T. Mutoh, S. Imagawa, S. Imagawa, T. Mito, T. Mito, Y. Nagayama, Y. Nagayama, K. Y. Watanabe, N. Ashikawa, N. Ashikawa, H. Chikaraishi, H. Chikaraishi, A. Ejiri, M. Furukawa, T. Fujita, S. Hamaguchi, H. Igami, M. Isobe, M. Isobe, S. Masuzaki, T. Morisaki, G. Motojima, K. Nagasaki, H. Nakano, Y. Oya, C. Suzuki, Y. Suzuki, Y. Suzuki, R. Sakamoto, R. Sakamoto, M. Sakamoto, A. Sanpei, H. Takahashi, H. Tsuchiya, M. Tokitani, Y. Ueda, Y. Yoshimura
Nuclear Fusion   55    Jul 2015
© 2015 IAEA, Vienna. The progress in the understanding of the physics and the concurrent parameter extension in the large helical device since the last IAEA-FEC, in 2012 (Kaneko O et al 2013 Nucl. Fusion 53 095024), is reviewed. Plasma with high i...
K. Ida, M. Yoshinuma, H. Tsuchiya, T. Kobayashi, C. Suzuki, M. Yokoyama, A. Shimizu, K. Nagaoka, S. Inagaki, K. Itoh, T. Akiyama, M. Emoto, T. Evans, A. Dinklage, X. Du, K. Fujii, M. Goto, T. Goto, M. Hasuo, C. Hidalgo, K. Ichiguchi, A. Ishizawa, M. Jakubowski, K. Kamiya, H. Kasahara, G. Kawamura, D. Kato, M. Kobayashi, S. Morita, K. Mukai, I. Murakami, S. Murakami, Y. Narushima, M. Nunami, S. Ohdach, N. Ohno, M. Osakabe, N. Pablant, S. Sakakibara, T. Seki, T. Shimozuma, M. Shoji, S. Sudo, K. Tanaka, T. Tokuzawa, Y. Todo, H. Wang, H. Yamada, Y. Takeiri, T. Mutoh, S. Imagawa, T. Mito, Y. Nagayama, K. Y. Watanabe, N. Ashikawa, H. Chikaraishi, A. Ejiri, M. Furukawa, T. Fujita, S. Hamaguchi, H. Igami, M. Isobe, S. Masuzaki, T. Morisaki, G. Motojima, K. Nagasaki, H. Nakano, Y. Oya, Y. Suzuki, R. Sakamoto, M. Sakamoto, A. Sanpei, H. Takahashi, M. Tokitani, Y. Ueda, Y. Yoshimura, S. Yamamoto, K. Nishimura, H. Sugama, T. Yamamoto, H. Idei, A. Isayama, S. Kitajima, S. Masamune, K. Shinohara, P. S. Bawankar, E. Bernard, M. Von Berkel, H. Funaba, X. L. Huang, T. Ii, T. Ido, K. Ikeda, S. Kamio, R. Kumazawa, C. Moon, S. Muto, J. Miyazawa, T. Ming, Y. Nakamura
Nature Communications   6    Jan 2015
© 2015 Macmillan Publishers Limited. All rights reserved. The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetize...
K. Fujii, S. Atsumi, S. Watanabe, T. Shikama, M. Goto, S. Morita, M. Hasuo
Review of Scientific Instruments   85    Feb 2014
We report development of a high dynamic range spectroscopic system comprising a spectrometer with 30% throughput and a camera with a low-noise fast-readout complementary metal-oxide semiconductor sensor. The system achieves a 10 6 dynamic range (∼...
T. Shikama, H. Kitaoka, M. Hasuo
Physics of Plasmas   21    Jan 2014
Anisotropy in the electron energy distribution function (EEDF) in an electron cyclotron resonance plasma with magnetized electrons and weakly magnetized ions is experimentally investigated using a directional Langmuir probe. Under an assumption of...
Taiichi Shikama, Shuhei Ogane, Hidekazu Ishii, Yohei Iida, Masahiro Hasuo
Japanese Journal of Applied Physics   53    Jan 2014
The helium 2 3 S metastable atom densities are experimentally evaluated by self-absorption spectroscopy of the HeI 2 3 S-2 3 P transition spectra in two kinds of cylindrical glow discharge plasmas, which have different radii and are operated unde...
O. Kaneko, O. Kaneko, H. Yamada, H. Yamada, S. Inagaki, M. Jakubowski, S. Kajita, S. Kitajima, Kobayashi, Kobayashi, K. Koga, T. Morisaki, S. Morita, S. Morita, T. Mutoh, T. Mutoh, S. Sakakibara, S. Sakakibara, Y. Suzuki, Y. Suzuki, H. Takahashi, K. Tanaka, K. Toi, Y. Yoshimura, T. Akiyama, Y. Asahi, N. Ashikawa, H. Chikaraishi, H. Chikaraishi, A. Cooper, D. S. Darrow, E. Drapiko, P. Drewelow, X. Du, A. Ejiri, M. Emoto, T. Evans, N. Ezumi, K. Fujii, T. Fukuda, H. Funaba, H. Funaba, M. Furukawa, D. A. Gates, M. Goto, M. Goto, T. Goto, W. Guttenfelder, S. Hamaguchi, M. Hasuo, T. Hino, Y. Hirooka, Y. Hirooka, K. Ichiguchi, K. Ichiguchi, K. Ida, K. Ida, H. Idei, T. Ido, H. Igami, K. Ikeda, S. Imagawa, S. Imagawa, T. Imai, M. Isobe, M. Isobe, M. Itagaki, T. Ito, K. Itoh, S. Itoh, A. Iwamoto, K. Kamiya, T. Kariya, H. Kasahara, N. Kasuya, D. Kato, T. Kato, K. Kawahata, K. Kawahata, F. Koike, S. Kubo, R. Kumazawa, D. Kuwahara, S. Lazerson, H. Lee, S. Masuzaki, S. Masuzaki, S. Matsuoka, H. Matsuura, A. Matsuyama, C. Michael, D. Mikkelsen, O. Mitarai, T. Mito, T. Mito, J. Miyazawa, J. Miyazawa, G. Motojima, K. Mukai, A. Murakami
Nuclear Fusion   53    Oct 2013
The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line...
S. Morita, S. Morita, C. F. Dong, M. Goto, D. Kato, I. Murakami, I. Murakami, H. A. Sakaue, M. Hasuo, F. Koike, N. Nakamura, T. Oishi, A. Sasaki, E. H. Wang
AIP Conference Proceedings   1545 143-152   Sep 2013
Tungsten spectra have been observed from Large Helical Device (LHD) and Compact electron Beam Ion Trap (CoBIT) in wavelength ranges of visible to EUV. The EUV spectra with unresolved transition array (UTA), e.g., 6g-4f, 5g-4f, 5f-4d and 5p-4d tran...
S. Morita, S. Morita, C. F. Dong, M. Kobayashi, M. Kobayashi, M. Goto, M. Goto, X. L. Huang, I. Murakami, T. Oishi, T. Oishi, E. H. Wang, N. Ashikawa, K. Fujii, M. Hasuo, H. Kasahara, D. Kato, F. Koike, S. Masuzaki, S. Masuzaki, H. A. Sakaue, T. Shikama, N. Yamaguchi
Nuclear Fusion   53    Sep 2013
In the Large Helical Device (LHD) operated with a met allic (stainless steel) first wall, it is found that the iron density, n Fe , at the plasma core is fairly low (n Fe 10 8 cm -3 ) in general neutral beam (NB)-heated discharges, while the iro...
T. Nishioka, T. Nishioka, T. Shikama, S. Nagamizo, K. Fujii, H. Zushi, M. Uchida, A. Iwamae, H. Tanaka, T. Maekawa, M. Hasuo
Review of Scientific Instruments   84    Jul 2013
The anisotropy of the electron velocity distribution function (EVDF) in plasmas can be deduced from the polarization of emissions induced by anisotropic electron-impact excitation. In this paper, we develop a compact thermal lithium atom beam sour...
K. Fujii, T. Shikama, M. Goto, S. Morita, M. Hasuo
Physics of Plasmas   20    Jan 2013
We observe the Balmer-α, -β, and -γ lines of hydrogen atoms and Q branches of the Fulcher-α band of hydrogen molecules simultaneously with their polarization resolved for large helical device. From the fit including the line splits and the polariz...
Hiraku Matsukuma, Hirotaka Tanaka, Yukihiro Takaie, Taiichi Shikama, Cristian Bahrim, Masahiro Hasuo
Journal of the Physical Society of Japan   81    Nov 2012
In a temperature controlled glow gaseous discharge of pure argon, or a mixture of argon and helium or neon at 77, 135, 190, 240, and 295 K, a linearly polarized laser pulse produces polarized argon atoms on the 2p 2 (in Paschen notation) level fro...
T. Shikama, N. Naka, N. Naka, M. Hasuo
Journal of Quantitative Spectroscopy and Radiative Transfer   113 294-298   Mar 2012
The CD A 2 Δ-X 2 Π transition spectra under an external magnetic field are calculated based on quantum mechanical perturbation method, and the results are compared with measurements in glow-discharge plasmas. The values of the equilibrium molecula...
Koichi Katayama, Taiichi Shikama, Masahiro Hasuo
Japanese Journal of Applied Physics   51    Feb 2012
We modulate the driving current of a distributed-feedback diode laser for the laser-light frequency to scan over the oxygen A-band (P11Q10, ν = 392:3220 THz) at the scan repetition rate from 0.1 to 10 kHz. The scan range is over 40 GHz below 1 kHz...
M. Goto, K. Sawada, K. Fujii, M. Hasuo, S. Morita
Journal of Physics: Conference Series   397    Jan 2012
We have carried out numerical inversion of the Laplace transform for the observed line profile, and have derived the intensity distribution function against the atom temperature. The temperature dependence is interpreted to the spatial dependence,...
M. Hasuo, K. Fujii, T. Shikama, S. Morita, M. Goto, H. Tanaka
Journal of Physics: Conference Series   397    Jan 2012
An aluminum pellet has been injected into a high-temperature plasma produced in the Large Helical Device (LHD). Emission from an ablation cloud of the pellet in a whole visible range is simultaneously measured with an echelle spectrometer having a...
Keisuke Fujii, Taiichi Shikama, Keiji Sawada, Keiji Sawada, Motoshi Goto, Shigeru Morita, Masahiro Hasuo
Plasma and Fusion Research   6    Dec 2011
We develop a collisional-radiative model for calculating the velocity distributions of excited hydrogen atoms. In the model, the velocity distributions are approximated using linear combinations of several basis functions which are treated as disc...
K. Fujii, T. Shikama, M. Goto, S. Morita, M. Hasuo
38th EPS Conference on Plasma Physics 2011, EPS 2011 - Europhysics Conference Abstracts   35 1 741-744   Dec 2011
Jun Yanagibayashi, Motoshi Goto, Chunfeng Dong, Shigeru Morita, Masahiro Hasuo
Plasma and Fusion Research   6    Dec 2011
We have observed Fe 14+ (3s 2 1 S 0 - 3s3p 1 P 1 ) and Fe 15+ (3s 2 S 1/2 - 3p 2 P 3/2 ) emissions from a LHD plasma with a space-resolved extreme-ultraviolet spectrometer. The observed intensity distributions against the viewing cho...
K. Mizushiri, K. Fujii, T. Shikama, A. Iwamae, M. Goto, S. Morita, M. Hasuo
Plasma Physics and Controlled Fusion   53    Oct 2011
We have developed a spectrometer specialized for simultaneous observation of helium emission lines from n = 3 to n = 2 levels, where n is the principal quantum number. The spectrometer is optimized for the light input coupled by 10 optical fibers ...
T. Shikama, M. Hasuo
Journal of Nuclear Materials   415    Aug 2011
A magnetic field effect on the Q-branch spectra of the CH A 2 Δ-X 2 Π transition is investigated using a pure methane glow discharge plasma installed in a superconducting magnet. The polarization resolved high-resolution spectra are measured under...
T. Shikama, K. Fujii, S. Kado, H. Zushi, M. Sakamoto, M. Sakamoto, A. Iwamae, M. Goto, S. Morita, M. Hasuo
Canadian Journal of Physics   89 495-501   May 2011
In spectroscopic measurements of magnetically confined torus plasmas, the line-integrated emission along a viewing chord is usually observed. However, by utilizing the dependence of the magnitude of the Zeeman splitting on the emission location, a...
H. Matsukuma, T. Shikama, M. Hasuo
Journal of Physics B: Atomic, Molecular and Optical Physics   44    Apr 2011
Using a positive column of helium-neon glow discharge plasma at several temperatures between 77 and 294 K, the disalignment rates of excited neon atoms in the 2p 5 and 2p 10 (in Paschen notation) levels are measured by a polarization-resolved la...
M. Goto, K. Sawada, K. Fujii, M. Hasuo, S. Morita
Nuclear Fusion   51    Feb 2011
The Balmer-α line profile is measured with high wavelength resolution for a discharge in the Large Helical Device. The line profile is regarded as a superposition of continuously varying Doppler broadened components and is expressed as the Laplace...
H. Matsukuma, C. Bahrim, T. Shikama, M. Hasuo
37th EPS Conference on Plasma Physics 2010, EPS 2010   3 1584-1587   Dec 2010
Keisuke Fujii, Keisuke Mizushiri, Tomomi Nishioka, Taiichi Shikama, Atsushi Iwamae, Motoshi Goto, Shigeru Morita, Masahiro Hasuo
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   623 690-692   Nov 2010
We have simultaneously measured high resolution emission spectra of the hydrogen atomic Balmer-α, -β, -γ lines and molecular Fulcher-α band for a LHD peripheral plasma generated under a central magnetic field strength of 0.4 T. It is found that th...
Jun Yanagibayashi, Tomohide Nakano, Atsushi Iwamae, Hirotaka Kubo, Masahiro Hasuo, Kiyoshi Itami
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   623 741-743   Nov 2010
The vacuum ultraviolet spectra of highly charged tungsten ions W 25 W 63 are calculated with the collisional-radiative modeling. The synthesized spectra of total tungsten ions are obtained using the fractional abundance of the ionization equilib...
Hangyu Zhou, Shigeru Morita, Shigeru Morita, Motoshi Goto, Motoshi Goto, Chunfeng Dong, Jun Yanagibayashi, Masahiro Hasuo
Review of Scientific Instruments   81    Oct 2010
Radial profile measurement of Z eff using visible bremsstrahlung (5300 Å) in the Large Helical Device (LHD) has often encountered difficulties because the intensity profile was largely deformed by the nonuniform visible bremsstrahlung emissions fr...
Atsushi Iwamae, Atsushi Iwamae, Atsushi Sakaue, Nobuhiro Neshi, Jun Yanagibayashi, Masahiro Hasuo, Motoshi Goto, Shigeru Morita
Physics of Plasmas   17    Sep 2010
Superdense core plasmas with a highly peaked electron density profile have been obtained in reduced recycling discharges in the Large Helical Device [O. Motojima, Phys. Plasmas 6, 1843 (1999)]. The polarization separation spectroscopy technique ha...
Atsushi Iwamae, Atsushi Iwamae, Atsushi Sakaue, Nobuhiro Neshi, Jun Yanagibayashi, Masahiro Hasuo, Motoshi Goto, Shigeru Morita
Journal of Physics B: Atomic, Molecular and Optical Physics   43    Jul 2010
The behaviour of neutral particles around the ergodic layer has been investigated by H α spectral profile measurements by means of a polarization-separation technique. Emission locations, atomic temperatures and velocity components along the line...
J. Yanagibayashi, T. Nakano, A. Iwamae, H. Kubo, M. Hasuo, K. Itami
Journal of Physics B: Atomic, Molecular and Optical Physics   43    Jul 2010
We observe the vacuum ultraviolet spectra of highly charged tungsten ions in plasmas at electron temperatures of 8 keV and 14 keV. The plasmas are produced by a tokamak JT-60U. The observed emission lines in a wavelength range of 2.6-3.2 nm for th...
K. Fujii, K. Mizushiri, T. Nishioka, T. Shikama, A. Iwamae, M. Goto, S. Morita, S. Kado, K. Sawada, M. Hasuo
Review of Scientific Instruments   81    Apr 2010
We developed a spectrometer specialized for simultaneous observation of the hydrogen Balmer- α, Β, -γ lines and the Fulcher- α v′ = v″ =2 rovibronic transition band. The spectrometer was optimized for the light input coupled by nine optical fibers...
Cristian Bahrim, Vaibhav Khadilkar, Hiraku Matsukuma, Masahiro Hasuo
Journal of Physics: Conference Series   194    Dec 2009
© 2009 IOP Publishing Ltd. Alignment relaxation of the Ne∗(2p 5 3p; 2p i [J1]) atoms (where i 2, 5, 7 or 10) induced by collisions with He atoms in glow discharges at 77 K < T < 1,000 K are reported. Close-coupling many-channel quantum calcula...
Shigeru Morita, Motoshi Goto, Masahiro Kobayashi, Sadatsugu Muto, Malay Bikas Chowdhuri, Chunfeng Dong, Hangyu Zhou, Cui Zhengying, Keisuke Fujii, Akihiro Furuzawa, Masahiro Hasuo, Atsushi Iwamae, Yinxian Jie, Mohammed Koubiti, Ikuya Sakurai, Yuzuru Tawara, Baonian Wan, Zhenwei Wu, Naohiro Yamaguchi
Plasma Science and Technology   11 402-408   Dec 2009
Impurity transport was investigated at both edge and core regions in large helical device (LHD) with developed spectroscopic instruments which can measure one- and two-dimensional distributions of impurities. The edge impurity behavior was studied...
T. Shikama, J. Yanagibayashi, K. Fujii, K. Mizushiri, T. Nishioka, M. Hasuo, S. Kado, H. Zushi
36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts   33 E2 1327-1330   Dec 2009
T. Shikama, K. Fujii, K. Mizushiri, M. Hasuo, S. Kado, H. Zushi
Plasma Physics and Controlled Fusion   51    Nov 2009
A scheme for computation of emission spectra of light diatomic molecules under external magnetic and electric fields is presented. As model species in fusion edge plasmas, the scheme is applied to polarization-resolved emission spectra of H 2 , CH...
T. Imagawa, T. Yoshida, T. Shikama, M. Hasuo
Journal of Physics B: Atomic, Molecular and Optical Physics   42    Apr 2009
In a temperature-controlled neon discharge cell under a magnetic field up to 7 T, a linearly polarized laser pulse has produced polarized neon atoms (atomic alignment) on the 2p 2 (in the Paschen notation) level from the 1s 3 level. The subsequent...
K. Deguchi, T. Imagawa, T. Shikama, M. Hasuo
Journal of Physics B: Atomic, Molecular and Optical Physics   42    Apr 2009
We have measured the relaxation rate of alignment of neon atoms in a 2p 2 (in Paschen notation) level, which were excited by a linearly polarized laser pulse in a glow discharge plasma at 77 K, in a magnetic field of up to 3 T in the Voigt configu...
Kazuhiro Deguchi, Michihiro Okuda, Atsushi Iwamae, Atsushi Iwamae, Hiroaki Nakamura, Keiji Sawada, Masahiro Hasuo
Journal of the Physical Society of Japan   78    Feb 2009
We calculate optical near fields generated by a periodically structured 50-nm-wide slit array of a 50-nm-thick gold film with a finite difference time domain method. Efficiencies of the electric quadrupole (E2) and magnetic dipole (M1) transitions...
Marco Hiroshi Naka, Masahiro Hasuo, Yoshio Fuwa, Ken Ikeuchi
Tribology International   40 200-207   Feb 2007
The lubrication mechanism of articular cartilage is characterized by an efficient performance. In this work, friction of articular cartilage was evaluated with in-site images of articular surface. The images were captured with the laser light refl...
M. Okuda, K. Deguchi, A. Iwamae, H. Nakamura, K. Sawada, M. Hasuo
Physica Status Solidi (C) Current Topics in Solid State Physics   3 3547-3552   Dec 2006
Laight propagation through a gold film with a periodically structured 50 nm width slit array into Cu 2 O has been calculated with a FDTD (Finite Difference Time Domain) method with a 5 nm mesh-grid. Owing to the presence of a guided mode in the sl...
Masahiro Hasuo, Atsuyoshi Shimamoto, Takeshi Fujiwara
Physica Status Solidi (C) Current Topics in Solid State Physics   3 3520-3526   Dec 2006
We have irradiated CuCl films, which are prepared by a vacuum vapor deposition method, with pico-second light pulses of 82 MHz repetition rate at the photon energy of 3.290 eV. After a long time of photo-irradiation, the photo-irradiated region is...
Rikio Kondo, Satoshi Tojo, Takashi Fujimoto, Masahiro Hasuo
Physical Review A - Atomic, Molecular, and Optical Physics   73    Jun 2006
We have observed attenuated total reflection at a glass/rubidium vapor interface in high precision. The atom density was from 3.8× 1020 to 3.7× 1021 m-3 and the angle of incidence was from 48.4 to 64.8°. Redshift and broadening of the reflection s...
M. Nimura, T. Imagawa, M. Hasuo, T. Fujimoto
Journal of Quantitative Spectroscopy and Radiative Transfer   96 547-564   Dec 2005
In a positive column of a glow discharge in the magnetic field of 36.4 G, a linearly polarized laser pulse or a circularly polarized laser pulse has produced polarized neon atoms (alignment or orientation) in the 2p 2 (Paschen notation) level from...
Masahiro Hasuo, Atsuyoshi Shimamoto, Takeshi Fujiwara, Norihiro Okuda, Atsushi Iwamae, Takashi Fujimoto
Journal of the Physical Society of Japan   74 3077-3081   Nov 2005
We have vapor-deposited CuCl films on rutile TiO 2 , Al 2 O 3 and synthesized quartz surfaces. The photoluminescence spectra of the films with the thickness from 50 to 1500 nm were observed and compared with that of bulk CuCl. The energy position ...
Atsuyoshi Shimamoto, Takeshi Fujiwara, Atsushi Iwamae, Takashi Fujimoto, Masahiro Hasuo
Journal of the Physical Society of Japan   74 1625-1628   May 2005
We have irradiated vapor-deposited CuCl films and bulk CuCl at 4.6 K with picosecond light pulses of 82 MHz repetition rate at the photon energy of 3.29 eV. Exciton luminescence having longitudinal optical (LO) phonon structures appeared in the ti...
M. Hasuo, A. Shimamoto, T. Fujimoto
Journal of Luminescence   112 181-185   Apr 2005
We have observed luminescence spectra of vapor-deposited CuCl films on rutile TiO2 under photo-irradiation with picosecond light pulses at 4.6 K. Decrease in the Z3-exciton and I1 luminescence intensities and an appearance of new exciton luminesce...
Satoshi Tojo, Satoshi Tojo, Masahiro Hasuo
Physical Review A - Atomic, Molecular, and Optical Physics   71    Jan 2005
The absorption line strengths of electric-dipole-forbidden (magnetic dipole and electric quadrupole) transitions have been calculated in the evanescent light field that accompanies the total reflection of light. Owing to the complex wave and polar...
Satoshi Tojo, Satoshi Tojo, Takashi Fujimoto, Masahiro Hasuo
Physical Review A - Atomic, Molecular, and Optical Physics   71    Jan 2005
Hyperfine-structure-resolved absorption spectra of the 6 2 S 1/2 →5 2 D 5/2 of cesium atoms have been observed i with a temperature-controlled cell and a diode laser. From a comparison with the absorption of the D 2 transition at the same a...
M. H. Naka, Y. Arima, H. Iwata, M. Hasuo, Y. Fuwa, Y. Morita, K. Ikeuchi
Tribology and Interface Engineering Series   48 389-397   Jan 2005
Evaluation of lubrication in articular cartilage has been developed with various techniques in order to obtain reasonable explanations about this superb mechanism. However, a definitive theory about this mechanism of lubrication is not clear until...
M. Nimura, M. Hasuo, T. Fujimoto
Journal of Physics B: Atomic, Molecular and Optical Physics   37 4647-4656   Dec 2004
Disorientation and disalignment of neon excited atoms in the fine-structure 2p 2 level (in Paschen notation) of the 2p 5 3p configuration have been investigated in a helium-neon glow discharge at temperatures between 17 and 300 K. The determined...
Satoshi Tojo, Masahiro Hasuo, Takashi Fujimoto
Physical Review Letters   92 530011-530014   Feb 2004
The reflection spectra of an electric quadrupole transition for the cesium atom (6 2 S 1/2 -5 2 D 5/2 ) line at an angle of incidence from θ c - 11.9 to θ c + 107.5 mrad was discussed. It was found that the oscillator strengths for s and p polariz...
Satoshi Tojo, Masahiro Hasuo, Takashi Fujimoto
Physical Review Letters   92 4   Jan 2004
We have observed for the first time reflection spectra of an electric quadrupole transition for the cesium atom ([Formula presented]) line at an angle of incidence from [Formula presented] to [Formula presented], where [Formula presented] is the...
Shintaro Kasai, Ryota Mizutani, Rikio Kondo, Masahiro Hasuo, Takashi Fujimoto
Journal of the Physical Society of Japan   72 1936-1942   Aug 2003
Velocity distributions of the 1s 3 (Paschen notation) metastable argon atoms (Ar*) in a 1 mm thick glow discharge cell have been examined by a Monte Carlo simulation model including Ar*(1s 3 )-Ar elastic collisions and collisional quenching of Ar...
Shintaro Kasai, Ryota Mizutani, Masahiro Hasuo, Takashi Fujimoto
Journal of the Physical Society of Japan   72 1932-1935   Aug 2003
Saturated absorption spectra of the 1s 3 -2p 2 (Paschen notation) line of metastable argon (Ar*) atoms in a 1 mm thick glow discharge cell have been observed at room temperature. We examined the pressure dependence of the spectra from 0.025 to 0....
Manabu Seo, Masanori Nimura, Masahiro Hasuo, Takashi Fujimoto
Journal of Physics B: Atomic, Molecular and Optical Physics   36 1869-1884   May 2003
In a positive column of a glow discharge, a linearly polarized laser pulse produces aligned neon atoms in the 2p 2 (Paschen notation) level, and the subsequent fluorescence is observed with its polarized components resolved. The relaxation rate o...
M. Seo, T. Shimamura, T. Furutani, M. Hasuo, C. Bahrim, T. Fujimoto
Journal of Physics B: Atomic, Molecular and Optical Physics   36 1885-1898   May 2003
Disalignment of neon excited atoms in the fine-structure 2p i levels (in Paschen notation) of the 2p 5 3p configuration is investigated in a helium-neon glow discharge at temperatures between 15 and 77 K. At several temperatures, we plot the disa...
D. Schneble, D. Schneble, M. Hasuo, M. Hasuo, T. Anker, T. Pfau, T. Pfau, J. Mlynek, J. Mlynek
Review of Scientific Instruments   74 2685-2689   May 2003
A scheme for the detection of cold metastable atoms at surfaces with spatial and temporal resolution was studied. A novel method for determining electron emission yields at surfaces was presented. The application of the detection scheme to time-of...
Satoshi Tojo, Yuuki Murakami, Masahiro Hasuo, Takashi Fujimoto
Journal of the Physical Society of Japan   72 1069-1072   May 2003
Absorption spectrum of the evanescent light at a glass/Rb vapor interface has been observed with atom density from 9 × 10 19 m -3 to 5 × 10 20 m -3 . Absorption is as high as 60% at the peak of a hyperfine structure split line. The absorption ...
M. Hasuo, A. Shimamoto, T. Fujimoto
Journal of Microscopy   209 177-181   Mar 2003
We have observed emission spectra of a CuCl film on a TiO 2 prism surface(110) associated with the two-photon excitation of the exciton system in total reflection geometry. The I 1 bound exciton emission, which resonantly appeared at the two-pho...
Dominik Schneble, Dominik Schneble, Masahiro Hasuo, Masahiro Hasuo, Thomas Anker, Tilman Pfau, Tilman Pfau, Jürgen Mlynek, Jürgen Mlynek
Journal of the Optical Society of America B: Optical Physics   20 648-651   Jan 2003
An elementary, continuously operating integrated circuit for atoms is produced. The circuit, which is realized by purely optical means, combines an atom source, a switchable channel guide and a local atom detector within the geometry of a planar a...
Yoshimi Ohta, Masahiro Hasuo, Takashi Fujimoto
Optics Communications   210 245-250   Sep 2002
For an argon glow discharge in a 1 mm thick cell at room temperature, we have observed the absorption spectrum of the 1s 3 -2p 2 (Paschen notation) line by using a diode laser. It is found that, with a decrease in the gas pressure below 0.1 Torr, ...
D. Schneble, M. Hasuo, Th Anker, T. Pfau, J. Mlynek
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest   2    Dec 2001
Optically controllable elements for integrated atom optics were realized with optical potentials in less than one micron distance from a surface consisting of continuous source, a quasi-2D shutterable atom beam, a local detector and a quasi-1D lat...
D. Schneble, M. Hasuo, M. Hasuo, Th Anker, T. Pfau, J. Mlynek
Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001   112   Jan 2001
© 2001 Optical Soc. Of America. Summary form only given. The realization of miniaturized and integrated atom-optical elements at surfaces is of interest for many applications ranging from precision measurements to quantum information processing. S...
N. Naka, M. Hasuo, N. Nagasawa
Fizika Tverdogo Tela   40 921-923   Dec 1998
Two-photon excitation spectra of photo-voltaic effects and relevant excitonic emissions of a naturally grown single crystal of CuiO have been studied at 77 K and 2 K. The photo-voltaic have been detected under local excitation at a macroscopical d...
N. Naka, M. Hasuo, N. Nagasawa
Physics of the Solid State   40 847-849   Jan 1998
Two-photon excitation spectra of photo-voltaic effects and relevant excitonic emissions of a naturally grown single crystal of Cu 2 O have been studied at 77 K and 2 K. The photo-voltaic effects have been detected under local excitation at a macro...
H. Kawano, K. Okinaka, M. Hasuo, M. Hasuo, N. Nagasawa
Journal of Luminescence   76-77 75-78   Jan 1998
Dispersion curve of a biexciton (XX) at k ∼ 0 in CuCl is measured using a high-precision polarization rotation spectroscopy. An energy minimum around k = 1 × 10 5 cm -1 is observed in the XX dispersion in some crystals. The fact is consistent with...
N. Naka, S. Kono, M. Hasuo, N. Nagasawa
Progress in Crystal Growth and Characterization of Materials   33 89-92   Jan 1996
Bose-Einstein statistics of 1s ortho- and para-excitons in commercially available natural single crystals of Cu 2 O is examined by spectral shape analysis of their phonon assisted emissions under a band-to-band excitation. It is confirmed that the...
M. Hasuo, N. Nagasawa
Progress in Crystal Growth and Characterization of Materials   33 85-88   Jan 1996
The Bose-Einstein statistics and the Bose-Einstein condensation(BEC) of biexcitons in CuCl are examined by the spectral shape analysis of the M-band and the phase-conjugation (PC) spectroscopy. It is found that the PC signal intensity increases wh...
H. Matsumoto, K. Saito, M. Hasuo, S. Kono, N. Nagasawa
Solid State Communications   97 125-129   Jan 1996
The yellow-exciton series in natural single crystals of Cu 2 O are studied by one- and two-photon spectroscopy in high precision at 2K. The energies of the p-exciton series are resolved up to 12p state in one-photon absorption spectra, while those...
S. Kono, N. Naka, M. Hasuo, S. Saito, T. Suemoto, N. Nagasawa
Solid State Communications   97 455-458   Jan 1996
Emission spectra of natural single crystals of Cu 2 O are examined under a two-photon excitation of Is ortho-excitons of yellow series in degenerate regime at 2K. It is found that a second harmonic generation (SHG) via an electric quadrupole trans...
M. Hasuo, H. Kawano, N. Nagasawa
Journal of Luminescence   66-67 396-400   Dec 1995
A new type of nonlinear polarization spectroscopy for precise measurements of the two-photon biexciton (XX) absorption in CuCl in the very weak excitation regime is developed. The spectral width, the two-photon absorption coefficient and the third...
M. Hasuo, N. Nagasawa
Journal of Luminescence   66-67 410-413   Dec 1995
Luminescence spectra of CuCl crystals are examined under strong photo-excitations of the giant two-photon absorption (GTA) band of biexcitons and the Z 3 -exciton band at 2 K. Nonlinear emissions that can be attributed to the radiative decay of a ...
S. Kono, M. Hasuo, N. Nagasawa
Journal of Luminescence   66-67 433-437   Dec 1995
Polarization characteristics for the two-photon transition to the 1s yellow ortho-exciton state in Cu 2 O is studied in degenerate one- and two-beam excitation regimes. It is confirmed that the experimental results are well in accordance with the ...
K. Saito, M. Hasuo, T. Hatano, N. Nagasawa
Solid State Communications   94 33-35   Jan 1995
Linear and nonlinear spectroscopical studies on s- and p-series of the Z3 -excitons in CuCl are carried out at 2K to evaluate the band gap energy and the binding energies of the Z3-excitons. Resonance energies of the 2p- and 3p-excitons are precis...
A. L. Ivanov, M. Hasuo, N. Nagasawa, H. Haug
Physical Review B   52 11017-11033   Jan 1995
The conventional giant oscillator strength model of the two-photon (γ) generation of an excitonic molecule (m) attributes this process to the x-γ optical conversion (where x is the exciton) i.e, to the scheme γ+γ→x+γ→m. Recenty [A.L. Ivanov and H....
M. Hasuo, H. Kawano, N. Nagasawa
physica status solidi (b)   188 77-81   Jan 1995
Two different theoretical models of the giant two‐photon absorption due to excitonic molecules (xx) are examined experimentally. The conventional model (Hanamura, 1973) follows the sequence: photon + photon → exciton + photon → xx, while the self‐...
M. Hasuo, M. Nishino, N. Nagasawa
Journal of Luminescence   60-61 672-675   Jan 1994
High resolution polarization rotation spectroscopy is performed to evaluate the third-order nonlinear susceptibility, | χ (3) |, associated with the giant two-photon absorption (GTA) of biexcitons in CuCl. The true width of the biexciton at K ≈ 0 ...
M. Hasuo, N. Nagasawa, T. Itoh, A. Mysyrowicz
Journal of Luminescence   60-61 758-761   Jan 1994
An experiment is described which aims at detecting the coherency associated with the presence of a Bose condensate of biexcitons in CuCl. The optical phase-conjugation signal at the two-photon resonance of the K = 0 biexciton is detected in the pr...
Masahiro Hasuo, Nobukata Nagasawa, Tadashi Itoh, André Mysyrowicz
Physical Review Letters   70 1303-1306   Jan 1993
The occupancy of the K=0 ground state of the biexciton in CuCl is measured by nonlinear optical methods. An increase of the optical phase conjugation signal is observed when a random high density of biexcitons is injected into the crystal. The cor...
T. Ando, M. Hasuo, N. Nagasawa
physica status solidi (b)   179 453-462   Jan 1993
The integrated optical absorption I (B) due to the Z 3 ‐triplet exciton in CuCl is measured at 4.2 K as a function of an external magnetic field B (O ≦ B ≦ 0.2 T) in Voigt configuration. I (B) shows the characteristic B‐dependence whose behaviour ...
M. Hasuo, N. Nagasawa, A. Mysyrowicz
physica status solidi (b)   173 255-262   Jan 1992
A new method is described that allows to detect the presence of a Bose condensate of biexcitons in a direct band gap material. It probes the accumulation of biexcitons in the coherent k = 0 state by measuring the increase of the optical phase conj...
M. Hasuo, N. Nagasawa, T. Itoh
Optics Communications   85 219-222   Sep 1991
Pulsed UV laser light of ∼ 1 μeV line width is generated from a laser system composed of a Ti-sapphire ring laser, an excimer laser pumped IR-dye amplifier, and a LiIO 3 frequency doubler. After focusing the UV light, a power density of the order ...
M. Hasuo, T. Hatano, N. Nagasawa
physica status solidi (b)   165    Jan 1991
M. Hasuo, N. Nagasawa
physica status solidi (b)   164 173-178   Jan 1991
The fine structure of the 2p‐exciton of KI single crystals due to envelope‐hole coupling is investigated by using high resolution two‐photon excitation spectroscopy. The energies of the split‐off 2P 1/2 , 2P 3/2 , and 2P 5/2 states are (6.1990 ± ...
Nobukata Nagasawa, Tadashi Hatano, Masahiro Hasuo
Proceedings of SPIE - The International Society for Optical Engineering   1268 116-122   Dec 1990
We study new structures peaked at the giant two-photon absorption (GTA) of biexcitons and peaked at ℏω-iTex/ of the biexciton origin in CuCl at 2 K in the ex...
A. Hirabayashi, Y. Nambu, M. Hasuo, T. Fujimoto
Physical Review A   37 77-82   Jan 1988
A pulsed helium-discharge plasma was found to have two peaks in the temporal development of its emission line intensities. At these peaks the population densities of the n 3D state (n=3,4,...) were measured. For the first peak, the populations wer...
A. Hirabayashi, Y. Nambu, M. Hasuo, T. Fujimoto
Physical Review A   37 83-88   Jan 1988
The laser-induced-fluorescence spectroscopy has been applied to an afterglow plasma (2 torr of 5% neon and 95% helium mixture gas), and we have observed disalignment of the neon 2p2-level atoms under the condition of ne=5.1×1019 m-3 and Te=2.0×103...

Research Grants & Projects

 
Evanescent spectroscopy on atoms and solids
Laser spectroscopy on atom and molecule collisions
Diffusion of resonance radiation and polarization relaxation