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Proceedings Paper

High-sensitivity and high-resolution Fourier-transform intracavity laser absorption spectroscopy (FT-ICLAS)
Author(s): Shuiming Hu; Hai Lin; Jixin Cheng; Shenggui He; Qing-Shi Zhu; Alexander A. Kachanov
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Paper Abstract

A high resolution and high sensitivity spectroscopic technique is developed by utilizing a Bruker IFS 120HR Fourier-transform spectrometer to detect the absorption spectra of samples inside a Ti:Sapphire laser cavity. A trigger-sampling system makes it possible to investigate the evolution of intra-cavity laser absorption spectra with the generation time. Owing to the multiplex advantage of FTS, the quantum noise in ICLAS can be significantly reduced in FT-ICLAS. The absorption of atmospheric water vapor in the range of 12450 - 12700 cm-1 was recorded at a resolution of 0.05 cm-1 to examine the performance of our FT-ICLAS apparatus. With 200 scans on the FT-ICLAS within 2 hours, a sensitivity of 10-9 cm-1 was obtained. It is also demonstrated that the FT-ICLAS is able to record both positions and intensities in a wide spectral range. This technique was applied to measure the HOD vOD equals 5 overtone in the range of 12550 - 12900 cm-1 with a resolution of 0.05 cm-1. The spectrum was analyzed with the ground states combination differences method and the spectroscopic parameters were obtained. For 81.1% rotational levels in this band, the difference between calculate and experimental energy was less than 0.01 cm-1 which indicated that both the recording and analyzing of this spectrum were successful.

Paper Details

Date Published: 25 January 2000
PDF: 5 pages
Proc. SPIE 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy, (25 January 2000); doi: 10.1117/12.375394
Show Author Affiliations
Shuiming Hu, Univ. of Science and Technology of China (China)
Hai Lin, Univ. of Science and Technology of China (China)
Jixin Cheng, Univ. of Science and Technology of China (China)
Shenggui He, Univ. of Science and Technology of China (China)
Qing-Shi Zhu, Univ. of Science and Technology of China (China)
Alexander A. Kachanov, Univ. Joseph Fourier (France)

Published in SPIE Proceedings Vol. 4063:
13th Symposium and School on High-Resolution Molecular Spectroscopy
Leonid N. Sinitsa, Editor(s)

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