A mid-infrared spectrometer based on difference frequency generation

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A mid-infrared spectrometer operating in the range from 3.42 to 4.78 μ m 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 3.70 μ m. The direct absorption spectra of pure methane and pure carbon dioxide samples were measured to test the performance of the spectrometer.

Original languageEnglish
Pages (from-to)1055-1058
Number of pages4
JournalOptics and Lasers in Engineering
Volume45
Issue number11
DOIs
StatePublished - Nov 2007
Externally publishedYes

Keywords

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

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