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.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.
Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon