KAJITA Masatoshi

J-GLOBAL         Last updated: Oct 9, 2019 at 11:43
KAJITA Masatoshi
National Institute of Information and Communications Technology
Job title
Chief Researcher
Ph. Doctor in Science

Research Areas


Academic & Professional Experience

Aug 2008
Aug 2009
Guest Professor, Province Univercity
Post Doctor at Institute for Molecular
- CRL (present name: NICT)


Dep. of Physics, University of Tokyo, Doctor Course
Dep. of Applied Physics, University of Tokyo

Awards & Honors

Sep 2019
Phase-coherent transfer and retrieval of terahertz frequency standard over 20 km optical fiber with 4 × 10-18 accuracy, JSAP Paper Award, The Japan Society of Applied Physics
Winner: NAGANO Shigeo, KUMAGAI Motohiro, ITO Hiroyuki, KAJITA Masatoshi, HANADO Yuko
Frequency uncertainty estimation for the 40CaH+ vibrational transition frequencies observed by Raman excitation, Highlight of 2012, IOP
Winner: Masatoshi Kajita and Minori Abe

Published Papers

Estimation of Blackbody Zeeman shift in 1S0 - 3P0 transition frequencies
KAJITA Masatoshi
Journal of Physical Society of Japan   88(10) 104001-1-104001-2   Sep 2019   [Refereed]
Fast numerical analysis of the time response in coherent population trapping resonance based on Galerkin spectral method
Yuichiro Yano, Masatoshi Kajita, Tetsuya Ido, and Motoaki Hara
Japanese Journal of Applied Physics   58 SGG805-1-SGG805-5   2019   [Refereed]
A reflection-type vapor cell using anisotropic etching of silicon for micro atomic clocks
Hitoshi Nishino, Motoaki Hara, Yuichiro Yano, Masaya Toda, Yoshiaki Kanamori, Masatoshi Kajita, Tetsuya Ido, and Takahito Ono
Applied Physics Express   12 072012-1-072012-5   2019   [Refereed]
Precise measurement of transition frequencies of optically trapped 40Ca19F molecules
KAJITA Masatoshi
Journal of Physical Society of Japan   87 104301-1-104301-3   Oct 2018   [Refereed]
Non-destructive monitoring of molecular vibrational transitions
KAJITA Masatoshi
Journal of Physical Society of Japan   87 074301-1-074301-3   Jul 2018   [Refereed]
Accurate ab initio calculations of spectroscopic constants and properties of BeLi+
Renu Bala, Huliyar S. Nataraj, Minori Abe, and Masatoshi Kajita
Journal of Molecular Spectroscopy   349 1-9   2018   [Refereed]
Microwave oscillator using piezoelectric thin-film resonator aiming for ultraminiaturization of atomic clock
M. Hara, Y. Yano, M. Kajita, H. Nishino, Y. Ibata, M. Toda, S. Hara, A. Kasamatsu, H. Ito, T. Ono, and T. Ido
Review of Scientific Instruments   89 105002-1-105002-7   2018   [Refereed]
Calculations of electronic properties and vibrational parameters of alkaline-earth lithides: MgLi+ and CaLi+
Renu Bala, H. S. Nataraj, Minori Abe, and Masatoshi Kajita
Molecular Physics   117 1-14   2018   [Refereed]
Prospects for a polar molecular ion optical probe of varying proton-electron mass ratio
Mark G. Kokish, Patrick R. Stollenwerk, Masatoshi Kajita, and Brian C. Odom
Physical Review A   98 052513-1-052513-12   2018   [Refereed]
Search for the variation in (mp/me) using two vibrational transition frequencies of molecular ions
KAJITA Masatoshi
Journal of Physical Society of Japan   86 123301-1-123301-3   Nov 2017   [Refereed]
Phase-coherent transfer and retrieval of terahertz frequency standard over 20 km optical fiber with 4 x 10-18 accuracy
Shigeo Nagano, Motohiro Kumagai, Hiroyuki Ito, Masatoshi Kajita, and Yuko Hanado
Applied Physics Express   10 012502-1-012502-4   2017   [Refereed]
Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock
Yuichiro Yano, Shigeyoshi Goka, and Masatoshi Kajita
Applied Physics B   123 67-1-67-8   2017   [Refereed]
Coherent Population Trapping atomic clock by phase modulation for wide locking range
Yuichiro Yano, Masatoshi Kajita, Tetsuya Ido, and Motoaki Hara
Applied Physics Letters   111 201107-1-201107-4   2017   [Refereed]
Accuracy estimation of the 16O2+ transition frequencies targeting the search for the variation in the proton-electron mass ratio
KAJITA Masatoshi
Physical Review A   95 023418-1-023418-6   2017   [Refereed]
Evaluation of variation in (mp/me) from the frequency difference between the 15N2+ and 87Sr transitions
KAJITA Masatoshi
Applied Physics B   122 203-1-203-5   2016   [Refereed]
Prospect of molecular clocks
KAJITA Masatoshi
Asian Journal of Physics   25(9) 1051-1059   2016   [Refereed]
Two-step pulse observation for Raman-Ramsey coherent population trapping atomic clocks
Yuichiro Yano, Shigeyoshi Goka, and Masatoshi Kajita
applied Physics Express   8 012801-1-012802-4   2015   [Refereed]
N 2 + quadrupole transitions with small Zeeman shift
KAJITA Masatoshi
Physical Review A   92 043423-1-043423-6   2015   [Refereed]
Characterizing of variation in the proton-to-electron mass ratio via precise measurements of molecular vibrational transition frequencies
Masatoshi Kajita, Geetha Gopakumar, Minori Abe, and Masahiko Hada
Journal of Molecular Spectroscopy   300 99-107   2014   [Refereed]
Dipole Polarizability of Alkaline-Earth-Metal (Ca, Sr)-Alkali-Metal (Na, K, Rb) Polar Molecules: Prospects for Alignment
Geetha Gopakumar, Minori Abe, Masahiko Hada, and Masatoshi Kajita
Journal of Chemical Physics   140 224303-1-224303-8   2014   [Refereed]


Masatoshi Kajita, Geetha Gopakumar, Minori Abe, and Masahiko Hada
Physical Review A   84(2,Pt.A) 022507   2011
H. L. Bethlem, M. Kajita, B. Sartakov, G. Meijer, and W. Ubachs
Euro. Phys. J. Spec. Topics   163 55-69   2008
Y. Li, S. Nagano, K. Matsubara, H. Ito, M. Kajita, and M. Hosokawa
Jpn. J. Appl. Phys.   47 6327   2008

Books etc

Measurement, Uncertainty and Lasers
KAJITA Masatoshi
IOP Expanding Physics   Apr 2019   ISBN:978-0-7503-2328-4
The role of lasers for the revolution of precise measurement and developments of physics.
Measuring Time: Frequency Measurements and related developments in physics
KAJITA Masatoshi
IOP Expanding Physics   Sep 2018   ISBN:978-0-7503-2124-2
The important contributions of frequency precise measurement for the development of physics are introduced.

Conference Activities & Talks

Measurement of molecular transition frequencies with the uncertainties lower than 10-17
KAJITA Masatoshi
European Quantum Electronisc conference 2019   25 Jun 2019   
Prospect of Molecular Clocks [Invited]
KAJITA Masatoshi
Workshop “Current Trend and Future Directions in Relativistic Many Electron Theories”   Sep 2016   
Detection of variance in mp/me by the precise measurement of cold trapped molecules [Invited]
KAJITA Masatoshi
Cold Atoms and Molecules: Collisions, Field-Effects, and Applications   Jun 2009   

Research Grants & Projects

Japan Society for the Promotion of Science: Grand inAcid for Scientific Research (C)
Project Year: Apr 2017 - Mar 2020    Investigator(s): KAJITA Masatoshi
Atomic frequency standard
Atomic Molecular Optical Physics