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

作者：Gao, Bo^*; Jiang, Wei; Liu, An-Wen; Lu, Yan; Cheng, Cun-Feng; Cheng, Guo-Sheng; Hu, Shui-Ming

来源：Review of Scientific Instruments, 2010, 81(4): 043105.

DOI：10.1063/1.3385675

• Doppler broadening
• Fabry-Perot interferometers
• infrared spectra
• infrared spectrometers
• organic compounds
• ring lasers
• sapphire
• spectrochemical analysis
• titanium

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.

• 出版日期2010-4
• 单位中国科学技术大学