We demonstrate an automatic channel-switched intracavity- absorption acetylene sensor via Sagnac loop filter based on the mode-competition in a ring fiber laser. When the photonic crystal fiber gas cell is filled with 1% acetylene, the corresponding absorption intensity can be ~14.0 dB and ~7.2 dB at 1532.83 nm and 1534.01 nm, respectively. Compared with the single transmission pass method, the sensitivity can be improved up to more than 10 times. It spends 50 seconds in scanning the absorption spectra through applying gradient voltage to the tunable F-P filter.
Haiwei Zhang, Wei Shi, Liangcheng Duan, Ying Lu, Quan Sheng, and Jianquan Yao, "Automatic channel-switched intracavity-absorption acetylene sensor based on mode-competition via Sagnac loop filter," Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901G (Presented at SPIE LASE: February 02, 2017; Published: 27 February 2017); https://doi.org/10.1117/12.2251294.
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