使用短外腔和分布反馈激光二极管的可调谐二极管激光吸收光谱仪的工作特性。

Operating characteristics of a tunable diode laser absorption spectrometer using short-external-cavity and DFB laser diodes.

作者信息

Ventrudo B F, Cassidy D T

出版信息

Appl Opt. 1990 Nov 20;29(33):5007-13. doi: 10.1364/AO.29.005007.

DOI:10.1364/AO.29.005007

PMID:20577498

Abstract

Second harmonic detection at audio frequencies of isolated absorption lines with a laser absorption spectrometer employing AlGaAs and InGaAsP diode lasers, short external cavity (SXC) AlGaAs and InGaAsP diode lasers, and InGaAsP distributed feedback (DFB) diode lasers was investigated and compared. Noise levels equivalent to line center absorptions of ~3 x 10(-6) were achieved with each source. Single mode tuning ranges of 20-50 cm(-1) were obtained with both the SXC and DFB sources. The contamination of absorption spectra by suppressed laser side modes was identified and investigated as it relates to the identification of weak lines in the presence of strong lines.

摘要

利用采用AlGaAs和InGaAsP二极管激光器、短外腔（SXC）AlGaAs和InGaAsP二极管激光器以及InGaAsP分布反馈（DFB）二极管激光器的激光吸收光谱仪，对音频频率下孤立吸收线的二次谐波检测进行了研究和比较。每种光源都实现了相当于约3×10⁻⁶线中心吸收的噪声水平。SXC和DFB光源都获得了20 - 50 cm⁻¹的单模调谐范围。识别并研究了被抑制的激光边模对吸收光谱的污染，因为它与在强线存在的情况下识别弱线有关。