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Thermal beam distortions in end-pumped Nd:YAG, Nd:GSGG, and Nd:YLF rods

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5 Author(s)
Pfistner, C. ; Inst. of Applied Phys., Univ. of Berne, Switzerland ; Weber, R. ; Weber, H.P. ; Merazzi, S.
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The thermally induced beam distortions in end-pumped Nd:YAG, Nd:GSGG, and Nd:YLF rods were analyzed and the influence of edge- and face-cooling was investigated. The distributions of temperature, stress, and strain in the crystals were calculated by finite element analysis. Based on these data, the space-resolved changes of the refractive index were determined considering thermal dispersion, surface deformation, and strain-induced birefringence. The resulting optical path difference for one round-trip in the end-pumped rods was integrated numerically. For each rod, the induced thermal lens was determined over the extent of the pump spot radius. The calculations of the optical path difference were experimentally confirmed by investigations using a modified Twyman-Green interferometer with a polarized HeNe probe beam at 633 nm under lasing and nonlasing conditions

Published in:

Quantum Electronics, IEEE Journal of  (Volume:30 ,  Issue: 7 )

Date of Publication:

Jul 1994

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