Ultrasensitive near-infrared cavity ring-down spectrometer for precise line profile measurement

被引：24

作者：

Gao, Bo ^{[1
]}

Jiang, Wei ^{[1
]}

Liu, An-Wen ^{[1
]}

Lu, Yan ^{[1
]}

Cheng, Cun-Feng ^{[1
]}

Cheng, Guo-Sheng ^{[1
]}

Hu, Shui-Ming ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2010年 / 81卷 / 04期

关键词：

Doppler broadening; Fabry-Perot interferometers; infrared spectra; infrared spectrometers; organic compounds; ring lasers; sapphire; spectrochemical analysis; titanium; ABSORPTION-MEASUREMENTS; MU-M; SPECTROSCOPY; BAND; (CH4)-C-12; RADICALS;

D O I：

10.1063/1.3385675

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A cavity ring-down (CRD) spectrometer is built with a continuous-wave Ti:sapphire ring laser. Using a pair of R similar to 0.999 95 high-reflective mirrors, the noise-equivalent minimum detectable absorption loss reaches 7x10(-11)/cm over the spectral range of 780-830 nm. A thermal-stabilized Fabry-Perot interferometer is applied to calibrate the CRD spectrum with an accuracy of 1x10(-4) cm(-1). The quantitative measurement is carried out for the line profile measurements of some overtone absorption lines of C(2)H(2) near 787 nm. Doppler determined line shape has been observed with milli-Torr acetylene gas in the ring-down cavity. The instrumental line width is estimated from the line profile fitting to be < 1x10(-4) cm(-1). It demonstrates that the CRD spectrometer with extremely high sensitivity is also very suitable for quantitative measurements including precise line profile studies in the near-infrared.

引用

页数：5

共 26 条

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