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

Teboho Bell; Darryl Naidoo; Sandile Ngcobo; Andrew Forbes

doi:10.1117/12.2205141

22 April 2016 Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor

Teboho Bell, Darryl Naidoo, Sandile Ngcobo, Andrew Forbes

Author Affiliations +

Proceedings Volume 9727, Laser Resonators, Microresonators, and Beam Control XVIII; 97271L (2016) https://doi.org/10.1117/12.2205141
Event: SPIE LASE, 2016, San Francisco, California, United States

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.

Citation Download Citation

Teboho Bell, Darryl Naidoo, Sandile Ngcobo, and 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); https://doi.org/10.1117/12.2205141

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