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Proceedings Paper

Modeling of pulsed K DPAL taking into account the spatial variation of the pump and laser intensities in the transverse direction
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Paper Abstract

We report on a model of highly efficient static, pulsed K DPAL [Zhdanov et al, Optics Express 22, 17266 (2014)], where Gaussian spatial shapes of the pump and laser intensities in any cross section of the beams are assumed. The model shows good agreement between the calculated and measured dependence of the laser power on the incident pump power. In particular, the model reproduces the observed threshold pump power, 22 W (corresponding to pump intensity of 4 kW/cm2), which is much higher than that predicted by the standard semi-analytical models of the DPAL. The reason for the large values of the threshold power is that the volume occupied by the excited K atoms contributing to the spontaneous emission is much larger than the volumes of the pump and laser beams in the laser cell, resulting in very large energy losses due to the spontaneous emission. To reduce the adverse effect of the high threshold power, high pump power is needed, and therefore gas flow with high gas velocity to avoid heating the gas has to be applied. Thus, for obtaining high power, highly efficient K DPAL, subsonic or supersonic flowing-gas device is needed.

Paper Details

Date Published: 27 October 2015
PDF: 10 pages
Proc. SPIE 9650, Technologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems, 96500B (27 October 2015); doi: 10.1117/12.2193579
Show Author Affiliations
Boris D. Barmashenko, Ben-Gurion Univ. of the Negev (Israel)
Ilya Auslender, Ben-Gurion Univ. of the Negev (Israel)
Salman Rosenwaks, Ben-Gurion Univ. of the Negev (Israel)
Boris Zhdanov, U.S. Air Force Academy, Laser and Optics Research Ctr. (United States)
Matthew Rotondaro, U.S. Air Force Academy, Laser and Optics Research Ctr. (United States)
Randall J. Knize, U.S. Air Force Academy, Laser and Optics Research Ctr. (United States)


Published in SPIE Proceedings Vol. 9650:
Technologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems
David H. Titterton; Harro Ackermann; Willy L. Bohn; Robert J. Grasso; Mark A. Richardson, Editor(s)

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