中国激光, 2000, 27 (1): 16, 网络出版: 2006-08-09
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
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(1:1信噪比),并测出砷烷分子振动量子数为6的高分辨泛频谱。
Abstract
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 AsH3 was first recorded with this instrument.
郝绿原, 韩家祥, 史强, 张竞辉, 朱清时. 高灵敏高分辨钛宝石激光光声光谱仪——光学长程+声学共振[J]. 中国激光, 2000, 27(1): 16. 郝绿原, 韩家祥, 史强, 张竞辉, 朱清时. A Highly Sensitive Doppler Limited Photoacoustic Overtone Spectrometer with a Ti:sapphire Ring Laser—Optical Multipass and Acoustic Resonance[J]. Chinese Journal of Lasers, 2000, 27(1): 16.