2014年7月
Highly precise and accurate terahertz polarization measurements based on electro-optic sampling with polarization modulation of probe pulses
OPTICS EXPRESS
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- 巻
- 22
- 号
- 15
- 開始ページ
- 17915
- 終了ページ
- 17929
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1364/OE.22.017915
- 出版者・発行元
- OPTICAL SOC AMER
We have developed an electro-optic (EO) sampling method with polarization modulation of probe pulses; this method allows us to measure the direction of a terahertz (THz) electric-field vector with a precision of 0.1 mrad in a data acquisition time of 660 ms using a 14.0-kHz repetition rate pulsed light source. Through combination with a THz time-domain spectroscopy technique, a time-dependent two-dimensional THz electric field was obtained. We used a photoelastic modulator for probe-polarization modulation and a (111)-oriented zincblende crystal as the EO crystal. Using the tilted pulse front excitation method with stable regeneratively amplified pulses, we prepared stable and intense THz pulses and performed pulse-by-pulse analog-to-digital conversion of the signals. These techniques significantly reduced statistical errors and enabled sub-mrad THz polarization measurements. We examined the performance of this method by measuring a wire-grid polarizer as a sample. The present method will open a new frontier of high-precision THz polarization sensitive measurements. (C) 2014 Optical Society of America
- リンク情報
- ID情報
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- DOI : 10.1364/OE.22.017915
- ISSN : 1094-4087
- Web of Science ID : WOS:000340685600033