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Proceedings Paper

Creation of high-energy far-infrared H2O gasdynamic laser: experimental and theoretical studies
Author(s): Alexander M. Starik
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Paper 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.

Paper Details

Date Published: 13 September 2002
PDF: 8 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482063
Show Author Affiliations
Alexander M. Starik, Central Institute of Aviation Motors (Russia)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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