Release Time:2022-07-04  Hits:

Date of Publication: 2001-01-01

Journal: 光电子 激光

Institution: 光电工程与仪器科学学院

Issue: 9

Page Number: 923-926

ISSN: 1005-0086

Abstract: By mixing an external-cavity diode laser, tunable in 1.5-1.6 ��m, and a Q switched Nd:YAG laser at 1.064 ��m in periodically poled lithium niobate, a continuously tunable difference frequency generation in 3.35-3.66 ��m wavelength region is realized. The difference frequency generator (DFG) has a narrow line width of less then 1 MHz and an average output power of 0.2 mW. Comparing with optical parametric oscillator the DFG has a simple and compact configuration and has no oscillation threshold. Based on the DFG a photoacoustic spectrometer for trace gas sensing has been constructed. With this system photoacoustic spectrums of 0.1% CH4 gas in different pressure has been recorded. The experiment demonstrates the features and the ability of the system for trace gas measurement.

Note: 新增回溯数据