The relatively short lifetime of rare-gas discharge pump light sources
for high-power cw solid-state lasers is caused mainly by vaporized ca
thode emitter material reacting with the thermally highly loaded quart
z wall. The introduction of new bipolar electrodes without special emi
tter materials mounted on hot-ended molybdenum-cup seals, together wit
h 60-kHz ac operation, makes possible the application of a tungsten ha
lide cleaning cycle within the lamp bulb. This new type of high-power
rare-gas pump light source exhibits 20% better radiation efficiency, 2
0% lower Nd:YAG laser threshold, and considerably extended lifetime.