Direct measurement of O_2(a^1Δ) and O_2(X^3Σ) in chemical oxygen–iodine lasers with use of spontaneous Raman imaging

Gylys, V. T.; Rubin, Lawrence F.

doi:10.1364/ao.37.001026

Cited by 25 publications

(14 citation statements)

References 5 publications

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“…Raman spectroscopy Gylys and Rabin 31 have recently reported a complementary method for measuring the yield of singlet oxygen using Raman scattering. This method provides a direct measurement of the concentrations of both 0 2 ( 1 A) and 02(31) since the Raman cross sections for both these species are known.…”

Section: 6mentioning

confidence: 99%

Historical perspective of COIL diagnostics

Davis

2002

Gas and Chemical Lasers and Intense Beam Applications III

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Section: 6mentioning

confidence: 99%

Historical perspective of COIL diagnostics

Davis

2002

Gas and Chemical Lasers and Intense Beam Applications III

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“…The piston source method [3] detected the 1270 nm spontaneous radiation from O 2 (a 1 Δ) ---O 2 (X 3 Σ), but it was suppressed by the strong background of the Iodine fluorescence and other thermo radiate, spontaneous Raman method [4] suffered from the low Raman efficiency, and need very long integration time to get enough Raman signal exposure. Tunable diode laser absorption spectrum (TDLAS) method [5] and Cavity ring-down spectrum (CRDS) [6] were also proposed to detect the O 2 (a 1 Δ) production, and many valuable results were achieved, but there were still some disadvantages to conquer.…”

Section: Introductionmentioning

confidence: 99%

O₂(¹Δ_g) detection using broadband CARS

Liu

Guo

et al. 2015

SPIE Proceedings

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1 Δ g oxygen 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 1 Δ 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 O 2 ( 1 Δ 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 O 2 ( 1 Δ g ) and O 2 ( 3 Σ) ; 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 2 ( 1 Δ g )and O 2 ( 3 Σ ) have different wavelengths, and their intensity was proportional to the square of the concentration of O 2 ( 1 Δ g ) and O 2 ( 3 Σ). By changing the focus spot of pump and stokes laser, the concentration distribution of O 2 ( 1 Δ g ) and O 2 ( 3 Σ)at different position could be obtained.

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“…Because of the importance of these transitions, they are spectroscopically well-characterized and are still the focus of much recent work [4][5][6][7][8][9]. Several methods have been developed to measure singlet oxygen, including emission spectroscopy [10], tunable diode laser absorption spectroscopy [11], Raman scattering [12], intracavity laser absorption spectroscopy (ICLAS) [13], electron spin resonance (ESR) [14], and resonance enhanced multiphoton ionization (REMPI). However, a straightforward method of quantifying the density and temperature of singlet oxygen is still lacking.…”

Section: Introductionmentioning

confidence: 99%