CFD DPAL modeling for various schemes of flow configurations

Karol Waichman; Boris D. Barmashenko; Salman Rosenwaks

doi:10.1117/12.2067019

Abstract

Comprehensive analysis of kinetic and fluid dynamic processes in flowing-gas diode pumped alkali lasers (DPALs) using two- and three-dimensional computational fluid dynamics (2D and 3D CFD) models is reported for Cs DPALs. The models take into account effects of temperature rise and losses of alkali atoms due to ionization. Various gas flow regimes and transverse and parallel flow-optics directions configurations are studied. Optimization of the Cs DPAL parameters, using 3D CFD modeling, shows that applying high flow velocity and narrowband pumping, maximum lasing power as high as 40 kW can be obtained at pump power of 80 kW for transverse flow configuration in a pumped volume of ~ 0.7 cm³. At high pump power the calculated laser power is higher for the transverse scheme than for the parallel scheme because of a more efficient heat convection from the beam volume in the transverse configuration. The CFD models are applied to experimental devices and the calculated results are in good agreement with the measurements.

Citation Download Citation

Karol Waichman, Karol Waichman, Boris D. Barmashenko, Boris D. Barmashenko, Salman Rosenwaks, Salman Rosenwaks, "CFD DPAL modeling for various schemes of flow configurations", Proc. SPIE 9251, Technologies for Optical Countermeasures XI; and High-Power Lasers 2014: Technology and Systems, 92510U (7 October 2014); doi: 10.1117/12.2067019; https://doi.org/10.1117/12.2067019

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