Work

Raman Gas Analysis with External Power Build-Up Cavity of Line-Narrowed 407-nm Laser Diode

Year: 2025

Type: article

Abstract: An external power build-up cavity of a line-narrowed 407-nm laser diode for Raman gas analysis was demonstrated to possess good gas detection capabilities. By employing an ordinary laser diode without anti-reflection coating or and a bandpass interference filter in an external cavity resonance, the laser linewidth was narrowed by resonant optical feedback, and tens of watts of external cavity power were built up. The coupling mechanism between the semiconductor laser and the external cavity are discussed, as well as the noise background in the experimental results. The Raman spectrum of ambient air was analyzed, achieving a methane detection limit of 1 ppm.

Source: Sensors

DOI: 10.3390/s25154600

Authors: Zhongyi Yao, Xinbing Wang, Duluo Zuo

Institutions: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funder: National Key Research and Development Program of China