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Proceedings Paper

Applications of 4f and 6f harmonics detection in resolution of modulation-broadened spectra
Author(s): Liantuan Xiao; Chang-yong Li; Qian Li; Suotang Jia; Guosheng Zhou
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Paper Abstract

In this paper, the experiments are carried out by voltage modulating an external-cavity tunable diode laser (TDL). The 2f, 4f and 6f signals of the modulation frequency are measured with cesium D2 line and the experiment results are compared with theory. Studying results in that there are certain advantages to be gained by going to harmonic- detection greater than usual second (2f) the smaller signal strength at higher harmonics notwithstanding. It is shown that nearly overlapping lines may be better resolved by using 4f and 6f harmonic detection considering the much less modulation-broadened spectra. Results are applicable to trace gas detection using TDLs, and to other areas of spectroscopy and magnetic resonance where harmonic detection techniques are routinely employed to monitor weak signals.

Paper Details

Date Published: 8 September 1999
PDF: 4 pages
Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); doi: 10.1117/12.361127
Show Author Affiliations
Liantuan Xiao, Shanxi Univ. (China)
Chang-yong Li, Shanxi Univ. (China)
Qian Li, Shanxi Univ. (China)
Suotang Jia, Shanxi Univ. (China)
Guosheng Zhou, Shanxi Univ. (China)

Published in SPIE Proceedings Vol. 3862:
1999 International Conference on Industrial Lasers
Fuxi Gan; Horst Weber; Zaiguang Li; Qingming Chen, Editor(s)

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