TY - GEN
T1 - Semi-analytical and CFD model calculations of subsonic flowing-gas DPALs and their comparison to experimental results
AU - Barmashenko, Boris D.
AU - Rosenwaks, Salman
AU - Waichman, Karol
N1 - Publisher Copyright:
© 2015 SPIE.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - Application of two- and-three dimensional computational fluid dynamics (2D and 3D CFD) models to subsonic flowing-gas DPALs is reported. The 2D model is applied to a DPAL with optical resonator-flow field coaxial configuration and the 3D model is applied to an optical axis transverse to the flow configuration. The models take into account effects of temperature rise and losses of alkali atoms due to ionization. The 2D CFD model is applied to 1 kW flowing-gas Cs DPAL [A.V. Bogachev et al., Quantum Electron. 42, 95 (2012)] and the calculated results are in good agreement with the measurements. Comparison of the 2D CFD to semi-analytical model [B. D. Barmashenko and S. Rosenwaks, J. Opt. Soc. Am. B 30, 1118 (2013)] shows that for low pump power both models predict very close values of the laser power; however, at higher pump power, corresponding to saturation of the absorption of the pump transition, the laser power calculated using the 2D CFD model is much higher than that obtained using the semi-analytical model. At high pump power, the heat convection out of the laser resonator is more efficient for the transverse case than the coaxial case, the beam temperature is lower and consequently the calculated laser power is higher. 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.
AB - Application of two- and-three dimensional computational fluid dynamics (2D and 3D CFD) models to subsonic flowing-gas DPALs is reported. The 2D model is applied to a DPAL with optical resonator-flow field coaxial configuration and the 3D model is applied to an optical axis transverse to the flow configuration. The models take into account effects of temperature rise and losses of alkali atoms due to ionization. The 2D CFD model is applied to 1 kW flowing-gas Cs DPAL [A.V. Bogachev et al., Quantum Electron. 42, 95 (2012)] and the calculated results are in good agreement with the measurements. Comparison of the 2D CFD to semi-analytical model [B. D. Barmashenko and S. Rosenwaks, J. Opt. Soc. Am. B 30, 1118 (2013)] shows that for low pump power both models predict very close values of the laser power; however, at higher pump power, corresponding to saturation of the absorption of the pump transition, the laser power calculated using the 2D CFD model is much higher than that obtained using the semi-analytical model. At high pump power, the heat convection out of the laser resonator is more efficient for the transverse case than the coaxial case, the beam temperature is lower and consequently the calculated laser power is higher. 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.
KW - diode pumping
KW - gas flows
KW - gas lasers
UR - http://www.scopus.com/inward/record.url?scp=84924012136&partnerID=8YFLogxK
U2 - 10.1117/12.2070676
DO - 10.1117/12.2070676
M3 - Conference contribution
AN - SCOPUS:84924012136
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - XX International Symposium on High-Power Laser Systems and Applications 2014
A2 - Tang, Xiaolin
A2 - Chen, Shu
A2 - Tang, Chun
PB - SPIE
T2 - 20th International Symposium on High Power Systems and Applications 2014, HPLS and A 2014
Y2 - 25 August 2014 through 29 August 2014
ER -