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Proceedings Paper

Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor
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Paper Abstract

In this paper we experimentally demonstrate the measurement of thermally induced lensing, using a Shack-Hartmann wavefront sensor. We measured the thermally induced lens from the coefficient of defocus aberration using a Shack-Hartmann wavefront sensor (SHWFS). As a calibration technique, we infer the focal length of standard lenses probed by a collimated Gaussian beam of wavelength 633 nm. The technique was applied to an Nd:YAG crystal that is actively pumped by a diode laser operating at 808 nm. The results were compared to the results obtained by changing the properties of the end-pumped solid-state laser resonator operating at 1064 nm, where the length of an unstable plane-parallel laser resonator cavity is varied, and the laser output power was measured.

Paper Details

Date Published: 22 April 2016
PDF: 8 pages
Proc. SPIE 9727, Laser Resonators, Microresonators, and Beam Control XVIII, 97271L (22 April 2016); doi: 10.1117/12.2205141
Show Author Affiliations
Teboho Bell, CSIR National Laser Ctr. (South Africa)
Univ. of KawZulu-Natal (South Africa)
Darryl Naidoo, CSIR National Laser Ctr. (South Africa)
Sandile Ngcobo, CSIR National Laser Ctr. (South Africa)
Andrew Forbes, Univ. of the Witwatersrand (South Africa)


Published in SPIE Proceedings Vol. 9727:
Laser Resonators, Microresonators, and Beam Control XVIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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