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Proceedings Paper

Generation of pure TEMp0 modes using a friendly intracavity laser beam shaping technique
Author(s): Emmanuel Cagniot; Michael Fromager; Thomas Godin; Nicolas Passilly; Marc Brunel; Kamel Aït-Ameur
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Paper 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.

Paper Details

Date Published: 7 September 2011
PDF: 8 pages
Proc. SPIE 8130, Laser Beam Shaping XII, 813006 (7 September 2011); doi: 10.1117/12.892146
Show Author Affiliations
Emmanuel Cagniot, CIMAP, CNRS, Univ. de Caen (France)
Michael Fromager, CIMAP, CNRS, Univ. de Caen (France)
Thomas Godin, CIMAP, CNRS, Univ. de Caen (France)
Nicolas Passilly, FEMTO-ST, CNRS, Univ. de Franche Comté-ENSMM-UBM (France)
Marc Brunel, CORIA, CNRS, Univ. de Rouen (France)
Kamel Aït-Ameur, CIMAP, CNRS, Univ. de Caen (France)

Published in SPIE Proceedings Vol. 8130:
Laser Beam Shaping XII
Andrew Forbes; Todd E. Lizotte, Editor(s)

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