2021年第68回応用物理学会春季学術講演会

講演情報

一般セッション(口頭講演)

3 光・フォトニクス » 3.6 超高速・高強度レーザー

[19p-Z06-1~12] 3.6 超高速・高強度レーザー

2021年3月19日(金) 13:30 〜 16:30 Z06 (Z06)

戸倉川 正樹(電通大)

15:30 〜 15:45

[19p-Z06-9] Background-Free Absorption Spectroscopy on Methane using Mode-Locked Cr:ZnS Laser

〇(D)WENQING SONG1、DAIKI OKAZAKI1、IKKI MORICHIKA1、SATOSHI ASHIHARA1 (1.IIS, The Univ. of Tokyo)

キーワード:infrared spectroscopy, Cr:ZnS laser

Background-free (BF) methods have a great potential for ultrasensitive detection because the signal scales with the irradiance of the light source. In this study, we utilize our recently developed mode-locked Cr:ZnS laser to demonstrate BF spectroscopy based on coherent suppression of the background light with a Michelson interferometer for the v3 +v4 band of methane around 2.3μm. The spectrum of the BF signal we obtained shows the intensity proportional to the absorbance locating in the corresponding wavelength. Our analysis shows that the SNR of the BF method is enhanced compared to the traditional absorption spectroscopy.