High-sensitivity and high-resolution Fourier-transform intracavity laser absorption spectroscopy (FT-ICLAS)

Shuiming Hu; Hai Lin; Jixin Cheng; Shenggui He; Qing-Shi Zhu; Alexander A. Kachanov

doi:10.1117/12.375394

25 January 2000 High-sensitivity and high-resolution Fourier-transform intracavity laser absorption spectroscopy (FT-ICLAS)

Shuiming Hu, Hai Lin, Jixin Cheng, Shenggui He, Qing-Shi Zhu, Alexander A. Kachanov

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Proceedings Volume 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy; (2000) https://doi.org/10.1117/12.375394
Event: 13th Symposium and School on High-Resolution Molecular Spectroscopy, 1999, Tomsk, Russian Federation

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 v_OD 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.

Citation Download Citation

Shuiming Hu, Hai Lin, Jixin Cheng, Shenggui He, Qing-Shi Zhu, and Alexander A. Kachanov "High-sensitivity and high-resolution Fourier-transform intracavity laser absorption spectroscopy (FT-ICLAS)", Proc. SPIE 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy, (25 January 2000); https://doi.org/10.1117/12.375394

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KEYWORDS

Absorption

Spectroscopy

Fourier transforms

Signal to noise ratio

Laser spectroscopy

Sapphire lasers

Optical filters

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