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Proceedings Paper

O2 (1Δg) detection using broadband CARS
Author(s): Jinbo Liu; Jingwei Guo; Xianglong Cai; Baodong Gai; Qingkun Meng; Yuqi Jin
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Paper Abstract

1 Δg oxygen was the active medium of chemical oxygen iodine laser (COIL), the concentration and distribution of 1 Δg oxygen was important for the output power and beam quality. However, the current test technique, such as fluorescence detection method, absorption spectrum method could not get accurate 1 Δg oxygen information, due to the interference from the iodine fluorescence or the rigorous request of the laser source and optics and detection elements. The anti-stokes Raman spectrum of 1 Δg oxygen was regarded as a potential technique to obtain desirable signal, and the coherent anti-stokes Raman scatter (CARS) was the most feasible technique to get better signal to noise ratio (SNR). In this paper, we reported a broadband nanosecond coherent anti-stokes Raman scatter (CARS) detecting system built up for the detection of the concentration and distribution of O2( 1 Δg) in COIL:The second harmonic of a Nd: YAG pulse laser was separated into two parts, one part was used to pump a broadband nanosecond dye laser to generate light of 578-580 nm, which covered both stokes lines of O2 ( 1 Δg)and O2 (3 ∑); The other part was combined with dye laser output by a dichroic mirror, and then introduced into the detection region of COIL through a focus lens. CARS signals for O21 Δg)and O23 ∑)have different wavelengths, and their intensity was proportional to the square of the concentration of O21 Δg) and O2( 3 ∑). By changing the focus spot of pump and stokes laser, the concentration distribution of O21 Δg) and O23 ∑)at different position could be obtained.

Paper Details

Date Published: 3 February 2015
PDF: 10 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92551V (3 February 2015); doi: 10.1117/12.2065289
Show Author Affiliations
Jinbo Liu, Dalian Institute of Chemical Physics (China)
Jingwei Guo, Dalian Institute of Chemical Physics (China)
Xianglong Cai, Dalian Institute of Chemical Physics (China)
Changchun Univ. of Science and Technology (China)
Baodong Gai, Dalian Insititute of Chemical Physics (China)
Qingkun Meng, Dalian Insititute of Chemical Physics (China)
Yuqi Jin, Dalian Insititute of Chemical Physics (China)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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