講演情報
[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)
キーワード：
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.