Creation of high-energy far-infrared H2O gasdynamic laser: experimental and theoretical studies

Alexander M. Starik

doi:10.1117/12.482063

13 September 2002 Creation of high-energy far-infrared H₂O gasdynamic laser: experimental and theoretical studies

Alexander M. Starik

Proceedings Volume 4760, High-Power Laser Ablation IV; (2002) https://doi.org/10.1117/12.482063
Event: International Symposium on High-Power Laser Ablation 2002, 2002, Taos, New Mexico, United States

Abstract

Theoretical and experimental analysis of a possibility of creation of high-energy gasdynamic laser generating infrared radiation with wavelength (lambda) equals27.971 micrometers on the vibration-rotation transition 001(633) --> 020(5₅₀) of H₂O molecule is presented. It was shown that at expansion of preheated water vapour in a wedge-shaped supersonic nozzle with 30 degree(s) opening angle and critical section height h* less than or equal to mm the nonequilibrium population of vibrational levels 001 and 020 of H₂O molecules is realised for the pressures P₀equals0.2-0.5 MPa and the temperatures T₀equals1930-2580 K at the nozzle inlet. The numerical analysis has demonstrated that for a plate profiled nozzle whose supersonic section is designed to provide uninterrupted flow at initial parameters T₀equals2500 K, P₀equals0.3 MPa, h*equals0.1 mm and nozzle expansion ratio (epsilon) equals20 the amplification coefficient behind the nozzle may achieve 1 m^-1. In this case the specific radiation energy may be of about 20 J/g. The principal feature of H₂O-gasdynamic laser is necessity to use the nozzle with rapid expansion and small values of parameter P₀h*. The latter should be considerably less (in a factor of 50-100) than for traditional CO₂-gasdynamic lasers.

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Alexander M. Starik "Creation of high-energy far-infrared H₂O gasdynamic laser: experimental and theoretical studies", Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); https://doi.org/10.1117/12.482063

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KEYWORDS

Absorption

Molecules

Gas lasers

Molecular lasers

Carbon monoxide

Data modeling

Infrared radiation

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