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A mid-infrared spectrometer based on difference frequency generation

Authors:	Lunhua Deng Ling Han Wanguo Liang Zhensong Cao Changqing Xu Weijun Zhang Zhiben Gong Xiaoming Gao

Affiliation:	^aLaboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;^bEnvironmental Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;^cDepartment of Engineering Physics, MC Master University, 1280 Main Street West, Hamilton, Ontario, Canada

Abstract:	A mid-infrared spectrometer operating in the range from 3.42 to based on difference-frequency mixing of a tunable Ti:Sapphire laser and a diode-pumped monolithic Nd:YAG laser in periodically poled LiNbO₃ (PPLN) crystals was developed. A system line width of about 36 MHz was obtained. An energy conversion efficiency of 0.6 mW/W² was obtained at . The direct absorption spectra of pure methane and pure carbon dioxide samples were measured to test the performance of the spectrometer.

Keywords:	Tunable Ti:Sapphire laser Nd-YAG laser Trace gas detection
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