光学学报, 2001, 21 (3): 317, 网络出版: 2006-08-10
低频波长调制光谱的理论与实验研究
Theoretical and Experimental Investigation of Low-Frequency Wavelength Modulation Spectroscpy
谐波探测 外腔式二极管激光器 波长调制光谱 信噪比 harmonic detection external-cavity diode laser wavelength modulation spectroscopy signal-to-noise-ratio
摘要
通过调制半导体激光外腔压电陶瓷的电压实现低频波长调制,并慢扫描激光器的波长,测量了CS原子D2线[6S1/2(F=4)→6P3/2]的吸收光谱,利用锁相放大器处理了二次、四次、六次谐波信号,实验结果与理论分析相吻合,在实验过程中还发现高次谐波探测可以有效地提高探测信号的信噪比。
Abstract
A series of experiments are carried out by modulating piezo voltage of an external-cavity continuously tunalbe diode laser. Cesium atom D2 line (6S1/2→6P3/2) absorption spectrum is measured by harmonic detection with a lock-in amplifier. The results about various harmonic signals in experiment are agreement with that in theory. The high-order harmonic detection may result in a significant improvement in signal-to-noise-ratio (SNR).
李倩, 肖连团, 李昌勇, 贾锁堂, 周国生. 低频波长调制光谱的理论与实验研究[J]. 光学学报, 2001, 21(3): 317. 李倩, 肖连团, 李昌勇, 贾锁堂, 周国生. Theoretical and Experimental Investigation of Low-Frequency Wavelength Modulation Spectroscpy[J]. Acta Optica Sinica, 2001, 21(3): 317.