O2 (1Δg) detection using broadband CARS

Jinbo Liu; Jingwei Guo; Xianglong Cai; Baodong Gai; Qingkun Meng; Yuqi Jin

doi:10.1117/12.2065289

3 February 2015 O₂ (¹Δ_g) detection using broadband CARS

Jinbo Liu, Jingwei Guo, Xianglong Cai, Baodong Gai, Qingkun Meng, Yuqi Jin

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92551V (2015) https://doi.org/10.1117/12.2065289
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

¹Δ_goxygen was the active medium of chemical oxygen iodine laser (COIL), the concentration and distribution of ¹ Δ_g 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 Δ_g 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 ¹Δ_g 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( ¹Δ_g) 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 Δ_g）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 O₂（¹ Δ_g）and O₂ （³ ∑）have different wavelengths, and their intensity was proportional to the square of the concentration of O₂（¹Δ_g） and O₂( ³ ∑). By changing the focus spot of pump and stokes laser, the concentration distribution of O₂（¹ Δ_g） and O₂（³ ∑）at different position could be obtained.

Citation Download Citation

Jinbo Liu, Jingwei Guo, Xianglong Cai, Baodong Gai, Qingkun Meng, and Yuqi Jin "O₂ (¹Δ_g) detection using broadband CARS", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92551V (3 February 2015); https://doi.org/10.1117/12.2065289

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KEYWORDS

Oxygen

Chemical oxygen iodine lasers

Raman spectroscopy

Dye lasers

Signal detection

Carbon dioxide

Signal processing

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