TITLE

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

AUTHOR(S)
Bo Gao; Wei Jiang; An-Wen Liu; Yan Lu; Cun-Feng Cheng; Guo-Sheng Cheng; Shui-Ming Hu
PUB. DATE
April 2010
SOURCE
Review of Scientific Instruments;Apr2010, Vol. 81 Issue 4, p043105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A cavity ring-down (CRD) spectrometer is built with a continuous-wave Ti:sapphire ring laser. Using a pair of R∼0.999 95 high-reflective mirrors, the noise-equivalent minimum detectable absorption loss reaches 7×10-11/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 1×10-4 cm-1. The quantitative measurement is carried out for the line profile measurements of some overtone absorption lines of C2H2 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 <1×10-4 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.
ACCESSION #
50173707

 

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