[9p-C212-1~18] CS.3 Code-sharing session of 3.5 &3.7

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)English Presentation

[9p-C212-4] Highly sensitive spectroscopy using freely controllable optical-frequency comb (2-II)
Hybrid optical filtering-based ring-down comb spectroscopy for trace molecular detection

〇Liu Ningwu¹, Terabayashi Ryohei¹, Hashimoto Daiki¹, Kitajima Shotaro¹, Nishizawa Norihiko¹, Abe Hisashi², Tomita Hideki¹ (1.Nagoya Univ., 2.AIST)

Keywords:

Optical frequency comb,Hybrid optical filtering,Cavity ring-down spectroscopy

Optical frequency comb-based cavity ring-down spectroscopy (OFC-CRDS) provides a powerful approach for trace-gas analysis by combining the broadband and frequency-stable characteristics of OFCs with the high sensitivity of CRDS. Here, we propose a hybrid optical filtering scheme integrating VIPA and Vernier filters to overcome the bandwidth limitation of previous VIPA-based comb mode resolution while enabling high-resolution OFC-CRDS measurements. The proposed hybrid VIPA–Vernier filtered OFC-CRDS system successfully resolved more than 200 comb modes and measured methane absorption spectra around 1650 nm over an expanded bandwidth of 45 GHz.