利用周期极化铷钛酸砷晶体中的连续波差频产生进行中红外痕量气体检测。

Mid-infrared trace gas detection using continuous-wave difference frequency generation in periodically poled RbTiOAsO4.

作者信息

Chen W, Mouret G, Boucher D, Tittel F K

机构信息

MREID Universite du Littoral, Dunkerque, France.

出版信息

Appl Phys B. 2001 May;72(7):873-6. doi: 10.1007/s003400100561.

DOI:10.1007/s003400100561

PMID:11757570

Abstract

A tunable mid-infrared continuous-wave (cw) spectroscopic source in the 3.4-4.5 micrometers region is reported, based on difference frequency generation (DFG) in a quasi-phase-matched periodically poled RbTiOAsO4 (PPRTA) crystal. DFG power levels of 10 microW were generated at approximately 4 micrometers in a 20-mm long PPRTA crystal by mixing two cw single-frequency Ti:Al2O3 lasers operating near 713 nm and 871 nm, respectively, using a laser pump power of 300 mW. A quasi-phase-matched infrared wavelength-tuning bandwidth (FWHM) of ~ 12 cm-1 and a temperature tuning rate of 1.02 cm-1/degree C were achieved. Experimental details regarding the feasibility of trace gas detection based on absorption spectroscopy of CO2 in ambient air using this DFG radiation source are also described.

摘要

报道了一种基于准相位匹配周期性极化铷钛酸砷氧晶体（PPRTA）中的差频产生（DFG）的可调谐中红外连续波（cw）光谱源，其波长范围在3.4 - 4.5微米。通过将分别在713纳米和871纳米附近工作的两台连续波单频钛宝石激光器混合，使用300毫瓦的激光泵浦功率，在20毫米长的PPRTA晶体中，在约4微米处产生了10微瓦的DFG功率水平。实现了约12厘米-1的准相位匹配红外波长调谐带宽（半高宽）和1.02厘米-1/摄氏度的温度调谐速率。还描述了使用该DFG辐射源基于环境空气中二氧化碳吸收光谱进行痕量气体检测可行性的实验细节。