Abstract
Degradation in beam quality due to aberrated thermal lensing anddepolarization loss due to stress induced birefringence in end-pumpededge-cooled solid-state lasers are investigated. A simple model for thedependence of thermal lensing and degradation in beam quality on thetransverse intensity profile of the pump beam is presented. Experimentalmeasurements of thermal lensing, degradation in beam quality anddepolarization loss in a diode-bar-end-pumped Nd:YAG rod support the mainpredictions of the model and, in addition, show that there can be significantextra heating under non-lasing conditions compared to lasing conditions. Therole of energy transfer upconversion as a mechanism for additional heatloading under non-lasing conditions is considered. Finally, various strategiesfor limiting the impact of thermal lensing and thermally induced birefringenceon laser performance in simple end-pumped cavity configurations are reviewed.
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