22 April 2016 Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor
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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.
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Teboho Bell, Darryl Naidoo, Sandile Ngcobo, Andrew Forbes, "Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor", Proc. SPIE 9727, Laser Resonators, Microresonators, and Beam Control XVIII, 97271L (22 April 2016); doi: 10.1117/12.2205141; https://doi.org/10.1117/12.2205141
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