Role of the stimulated-emission rate in the photostability of solid-state dye lasers.
The lasing and photostability characteristics of Rhodamine 6G and Pyrromethene 567 dyes dispersed in polymeric host materials have been investigated as a function of the intensities of incident pump and signal beams in a longitudinally pumped dye laser in an oscillator-amplifier configuration. A substantial reduction in the rate of photodegradation was observed under lasing conditions and with increasing signal intensity in a dye amplifier, establishing that the service lives of these materials improve with an increase in the rate of stimulated emission. We observed approximately 62% amplifier efficiency at 2 Hz operation and 10% reduction in amplifier efficiency at 10 Hz operation after exposure of 72,000 pulses by use of a Pyrromethene disk.
Ray
Alok Kumar
AK
Bhabha Atomic Research Centre, Mumbai-400 085, India. alokray@magnum.barc.ernet.in
Kumar
Sasi
S
Mayekar
Narayan Vitthal
NV
Sinha
Sucharita
S
Kundu
Soumitra
S
Chattopadhyay
Subrata
S
Dasgupta
Kamalesh
K