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

Boris D. Barmashenko; Ilya Auslender; Salman Rosenwaks; Boris Zhdanov; Matthew Rotondaro; Randall J. Knize

doi:10.1117/12.2193579

27 October 2015 Modeling of pulsed K DPAL taking into account the spatial variation of the pump and laser intensities in the transverse direction

Boris D. Barmashenko, Ilya Auslender, Salman Rosenwaks, Boris Zhdanov, Matthew Rotondaro, Randall J. Knize

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Proceedings Volume 9650, Technologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems; 96500B (2015) https://doi.org/10.1117/12.2193579
Event: SPIE Security + Defence, 2015, Toulouse, France

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.

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Boris D. Barmashenko, Ilya Auslender, Salman Rosenwaks, Boris Zhdanov, Matthew Rotondaro, and Randall J. Knize "Modeling of pulsed K DPAL taking into account the spatial variation of the pump and laser intensities in the transverse direction", Proc. SPIE 9650, Technologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems, 96500B (27 October 2015); https://doi.org/10.1117/12.2193579

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KEYWORDS

Lasers

Absorption

Chemical species

Pulsed laser operation

Temperature metrology

Laser damage threshold

Beam shaping

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