TY - JOUR
T1 - Modeling of pulsed K diode pumped alkali laser
T2 - Analysis of the experimental results
AU - Auslender, Ilya
AU - Barmashenko, Boris
AU - Rosenwaks, Salman
AU - Zhdanov, Boris
AU - Rotondaro, Matthew
AU - Knize, Randall J.
N1 - Publisher Copyright: © 2015 Optical Society of America.
PY - 2015/8/10
Y1 - 2015/8/10
N2 - A simple optical model of K DPAL, where Gaussian spatial shapes of the pump and laser intensities in any cross section of the beams are assumed, is reported. The model, applied to the recently reported highly efficient static, pulsed K DPAL [Zhdanov et al, Optics Express 22, 17266 (2014)], 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.
AB - A simple optical model of K DPAL, where Gaussian spatial shapes of the pump and laser intensities in any cross section of the beams are assumed, is reported. The model, applied to the recently reported highly efficient static, pulsed K DPAL [Zhdanov et al, Optics Express 22, 17266 (2014)], 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.
UR - http://www.scopus.com/inward/record.url?scp=84957561142&partnerID=8YFLogxK
U2 - https://doi.org/10.1364/OE.23.020986
DO - https://doi.org/10.1364/OE.23.020986
M3 - Article
C2 - 26367951
SN - 1094-4087
VL - 23
SP - 20986
EP - 20996
JO - Optics Express
JF - Optics Express
IS - 16
ER -