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A mid-infrared spectrometer based on difference frequency generation

✍ Scribed by Lunhua Deng; Ling Han; Wanguo Liang; Zhensong Cao; Changqing Xu; Weijun Zhang; Zhiben Gong; Xiaoming Gao

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
246 KB
Volume
45
Category
Article
ISSN
0143-8166

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✦ Synopsis

A mid-infrared spectrometer operating in the range from 3.42 to 4:78 mm based on difference-frequency mixing of a tunable Ti:Sapphire laser and a diode-pumped monolithic Nd:YAG laser in periodically poled LiNbO 3 (PPLN) crystals was developed. A system line width of about 36 MHz was obtained. An energy conversion efficiency of 0.6 mW/W 2 was obtained at 3:70 mm. The direct absorption spectra of pure methane and pure carbon dioxide samples were measured to test the performance of the spectrometer.

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