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7 October 2014Study of potassium DPAL operation in pulsed and CW mode
This paper presents the results of our experiments on development of the efficient hydrocarbon free Diode Pumped
Alkali Laser based on potassium vapor buffered by He gas at 600 Torr. We studied the performance of this laser
operating in pulsed mode with pulses up to 5 ms long at different pulse energies and cell temperatures. A slope
efficiency of more than 50% was demonstrated with total optical efficiency about 30% for the pump pulses with duration
about 30 μs. For the longer pump pulses the DPAL efficiency degraded in time with a characteristic time in the range
from 0.5 ms to 4.5 ms depending on the pump pulse energy and cell temperature. The recorded spectrum of the side
fluorescence indicates that multi-photon excitation, energy pooling collisions and ionization may be strong candidates
for explaining the observed performance degradation.
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Boris V. Zhdanov, Matthew D. Rotondaro, Michael K. Schaffer, Randall J. Knize, "Study of potassium DPAL operation in pulsed and CW mode," Proc. SPIE 9251, Technologies for Optical Countermeasures XI; and High-Power Lasers 2014: Technology and Systems, 92510Y (7 October 2014); https://doi.org/10.1117/12.2074414