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Proceedings Paper

Intracavity beam shaping of a Nd:YAG laser
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Paper Abstract

To change the intensity distribution of the fundamental mode in a Nd:YAG laser resonator to a top-hat profile we developed and used a dielectric graded-phase mirror. A super-Gaussian mode of the sixth order was generated by means of a graded-phase mirror with a simple ring-shaped phase step on a spherical reflector. The depth of the ring was 90 nm. Measurements with continuous-wave and repetitively pulsed diode-laser pumping were performed and compared. The results are in excellent agreement with the theory. To allow for real-time modification of the modes, adaptive optics such as deformable mirrors can be used. Experiments with an adaptive mirror featuring eight actuators on a glass substrate were performed. It was not yet possible to generate super-Gaussian modes with a deformable mirror but the beam quality in the multi-mode regime was improved significantly without closed-loop electronics. A reduction of the M2 value by 39 % was achieved.

Paper Details

Date Published: 6 June 2002
PDF: 9 pages
Proc. SPIE 4629, Laser Resonators and Beam Control V, (6 June 2002); doi: 10.1117/12.469479
Show Author Affiliations
Michael Gerber, Univ. of Bern (Switzerland)
Alexis V. Kudryashov, Institute on Laser and Information Technologies (Russia)
Thomas Graf, Univ. of Bern (Switzerland)

Published in SPIE Proceedings Vol. 4629:
Laser Resonators and Beam Control V
Alexis V. Kudryashov, Editor(s)

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