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- W604537717 abstract "<sup>1 </sup>Δ<sub>g </sub>oxygen was the active medium of chemical oxygen iodine laser (COIL), the concentration and distribution of <sup>1</sup> Δ<sub>g</sub> 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 <sup>1</sup> Δ<sub>g</sub> 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 <sup>1 </sup>Δ<sub>g</sub> 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 O<sub>2</sub>( <sup>1 </sup>Δ<sub>g</sub>) 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 O<sub>2</sub> ( <sup>1</sup> Δ<sub>g</sub>）and O<sub>2</sub> (<sup>3 </sup>∑）; 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 O<sub>2</sub>（<sup>1</sup> Δ<sub>g</sub>）and O<sub>2</sub> （<sup>3</sup> ∑）have different wavelengths, and their intensity was proportional to the square of the concentration of O<sub>2</sub>（<sup>1 </sup>Δ<sub>g</sub>） and O<sub>2</sub>( <sup>3</sup> ∑). By changing the focus spot of pump and stokes laser, the concentration distribution of O<sub>2</sub>（<sup>1</sup> Δ<sub>g</sub>） and O<sub>2</sub>（<sup>3</sup> ∑）at different position could be obtained." @default.
- W604537717 created "2016-06-24" @default.
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- W604537717 date "2015-02-03" @default.
- W604537717 modified "2023-09-24" @default.
- W604537717 title "O2(1Δg) detection using broadband CARS" @default.
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- W604537717 doi "https://doi.org/10.1117/12.2065289" @default.
- W604537717 hasPublicationYear "2015" @default.
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