Generation of pure TEMp0 modes using a friendly intracavity laser beam shaping technique

Emmanuel Cagniot; Michael Fromager; Thomas Godin; Nicolas Passilly; Marc Brunel; Kamel Aït-Ameur

doi:10.1117/12.892146

7 September 2011 Generation of pure TEMp0 modes using a friendly intracavity laser beam shaping technique

Emmanuel Cagniot, Michael Fromager, Thomas Godin, Nicolas Passilly, Marc Brunel, Kamel Aït-Ameur

Proceedings Volume 8130, Laser Beam Shaping XII; 813006 (2011) https://doi.org/10.1117/12.892146
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

A variant of the Fox & Li method performing intra-cavity laser beam shaping for resonators containing an arbitrary number of amplitude and phase diffractive optics is presented. As an illustration, the problem of forcing a laser to oscillate on a single high-order transverse mode has been considered. In particular, from numerical simulation, we deduce a simple model for generating such modes with a pi-phase plate inserted into a plano-concave cavity. This model has been tested experimentally within an active cavity with a diode-pumped Nd:YVO₄ laser and an excellent agreement with numerical predictions has been found: a phase aperture located quite close to the concave mirror, and whose normalized radius κ is so that 2κ² corresponds to a zero of the desired p-order Laguerre polynomial, was sufficient to generate single cylindrical TEMp0 modes (p = 1, 2, 3) as long as its radius is correctly chosen. The laser based on the optimized features was perfectly stable, whatever the order of the generated mode.

Citation Download Citation

Emmanuel Cagniot, Michael Fromager, Thomas Godin, Nicolas Passilly, Marc Brunel, and Kamel Aït-Ameur "Generation of pure TEMp0 modes using a friendly intracavity laser beam shaping technique", Proc. SPIE 8130, Laser Beam Shaping XII, 813006 (7 September 2011); https://doi.org/10.1117/12.892146

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