高灵敏高分辨钛宝石激光光声光谱仪——光学长程+声学共振  

A Highly Sensitive Doppler Limited Photoacoustic Overtone Spectrometer with a Ti:sapphire Ring Laser—Optical Multipass and Acoustic Resonance

作　　者：郝绿原[1] 韩家祥[1] 史强[1] 张竞辉 朱清时[1] 

机构地区：[1]中国科学技术大学化学物理系,合肥230026

出　　处：《中国激光》2000年第1期16-22,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金

摘　　要：分析了影响光声信号大小的多种因素，特别是光声池的大小对光声信号的影响。使用适当尺寸的圆柱形光声池并使其工作在一阶径向共振状态，结合光学长程技术，显著提高了光声信号的信噪比。用钛宝石激光器作光源，光声光谱仪的探测灵敏度达８．５×１０－ ９ ｃｍ － １（１ｖ１ 信噪比），并测出砷烷分子振动量子数为６的高分辨泛频谱。The factors, especially the photoacoustic cell′s size, which have effects on the amplitude of the photoacoustic signal, are analysized. When a multipass cylindrical cell with optimal dimensions is operated in the first order radial resonance mode, the signal to noise ratio of photoacoustic signal can be greatly improved. Using a Ti∶sapphire ring laser as the light source, a laser photoacoustic spectrometer reaching a sensitivity of 8.5×10 -9 cm -1 (SNR=1∶1) is realized; then the sixth stretching overtone spectrum of AsH 3 was first recorded with this instrument.

关 键 词：光学共振 光声光谱仪 钛宝石激光 光学长程 

分 类 号：TH744.1[机械工程—光学工程]