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Date of Publication:2001-01-01

Journal:光电子 激光

Affiliation of Author(s):光电工程与仪器科学学院

Issue:9

Page Number:923-926

ISSN No.: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.

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