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25 January 2000 High-sensitivity and high-resolution Fourier-transform intracavity laser absorption spectroscopy (FT-ICLAS)
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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 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.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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