Photo-acoustic spectrometer with Ti:sapphire laser

Vladimir V. Lazarev; Yurii N. Ponomarev; Leonid N. Sinitsa; Jia-Xian Han; Lu-Yuan Hao; Qing-Shi Zhu

doi:10.1117/12.267776

3 March 1997 Photo-acoustic spectrometer with Ti:sapphire laser

Vladimir V. Lazarev, Yurii N. Ponomarev, Leonid N. Sinitsa, Jia-Xian Han, Lu-Yuan Hao, Qing-Shi Zhu

Proceedings Volume 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy; (1997) https://doi.org/10.1117/12.267776
Event: 12th Symposium and School on High Resolution Molecular Spectroscopy, 1996, St. Petersburg, Russian Federation

Abstract

A dual-channel photo-acoustic (PA) spectrometer using a single mode 1 W Ti-Sapphire laser with 50 kHz linewidth is described. The value of minimal detectable absorption coefficient equals of 10^-8cm^-1 was determined from the measurements of water absorption lines with well-known intensities. The PA spectrometer was applied to record weak absorption spectra of water, HDO, SiH₄, H₂Se, AsH₃ in 11,300 - 12,800 cm^-1 region. The photo-acoustic (PA) method based on the measurements of an optical radiation absorption by the substance under study. When the pulsed optical radiation passes through the cell containing an absorbing substance (molecular gas in our case) the last one heats due to the absorption. The heat of the gas in a closed volume of the PA cell produces the pulse of the pressure (Delta) p, which was detected by a sensitive microphone proportional optical radiation energy W and absorption coefficient of gas k(v).

Citation Download Citation

Vladimir V. Lazarev, Yurii N. Ponomarev, Leonid N. Sinitsa, Jia-Xian Han, Lu-Yuan Hao, and Qing-Shi Zhu "Photo-acoustic spectrometer with Ti:sapphire laser", Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); https://doi.org/10.1117/12.267776

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