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Temperature Dependence of the Refractive Index of the Laser Material CaLaSOAP:Nd.

The importance of thermal effects on the refractive indices of laser host materials operating under conditions of high heat loading has been known for some time; changes of refractive index with temperature can cause complicated lensing effects that, if not corrected, increase beam divergence. It has also been realized that similar thermal effects in windows used for laser beams of high average power can cause distortions serious enough to degrade system performance, even when the power density is well below the optical damage threshold for the window material.