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Proceedings Paper

Characterisation of birefringence of [111]-cut crystal rod using side-pumping and crystal rotation
Author(s): Thomas Graupeter; Rainer Hartmann; Christoph Pflaum
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Paper Abstract

Birefringence influences the beam quality and output power of high power solid-state lasers. Inhomogeneous distribution of the thermal field inside the laser crystal rod leads to thermal strains and birefringence, due to the photoelastic effect. Analytical models have used the plane stress and plane strain assumption for an axial sym- metric pumped crystal. This leads in case of an [111]-cut to an axially symmetric birefringence pattern. However, numerical calculations of birefringence show a threefold symmetry pattern due to the anisotropic behavior of the photoelastic tensor. This disturbs the ideal use of a radial or azimuthal polarised beam. We analyzed a laser rod pumped at three sides with threefold symmetry, in order to reduce the effect of birefringence. Simulation results show birefringence is affected by rotation of the crystal around its [111]-axis. Smallest birefringence can be obtained by an optimal rotation with respect to the edges of the crystal. Therefore the output beam of this laser device is more suitable for generating radial or azimuthal polarisations.

Paper Details

Date Published: 1 May 2014
PDF: 10 pages
Proc. SPIE 9135, Laser Sources and Applications II, 91351L (1 May 2014); doi: 10.1117/12.2052268
Show Author Affiliations
Thomas Graupeter, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Rainer Hartmann, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Christoph Pflaum, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 9135:
Laser Sources and Applications II
Jacob I. Mackenzie; Helena JelÍnková; Takunori Taira; Marwan Abdou Ahmed, Editor(s)

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