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Proceedings Paper

Diffraction-limited Nd:glass and alexandrite lasers using graded reflectivity mirror unstable resonators
Author(s): Kevin J. Snell; Gaetan Duplain; Andre Parent; Bruno Labranche; Pierre Galarneau
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Paper Abstract

A high reflectivity, graded reflectivity mirror (GRM) design has been recently developed for use in low-gain lasers. A GRM with 63% central reflectivity was used as an output coupler in a low magnification (M equals 1.4) unstable resonator Nd:Glass laser to obtain a Q-switched energy of 2 J in a 25 ns pulse and over 3.7 J in fixed-Q operation. The beam has a diffraction limited divergence of 0.15 mrad. In an Alexandrite laser, a GRM having a central reflectivity of 78% was used in a M equals 1.2 unstable resonator. A fixed-Q output energy of over 500 mJ and a Q-switched energy of 400 mJ was obtained in a diffraction-limited beam. The second harmonic output was increased by a factor of ten from that obtained with a multimode stable resonator.

Paper Details

Date Published: 1 July 1991
PDF: 8 pages
Proc. SPIE 1410, Solid State Lasers II, (1 July 1991); doi: 10.1117/12.43589
Show Author Affiliations
Kevin J. Snell, National Optics Institute (Canada)
Gaetan Duplain, National Optics Institute (Canada)
Andre Parent, National Optics Institute (Canada)
Bruno Labranche, National Optics Institute (Canada)
Pierre Galarneau, National Optics Institute (Canada)

Published in SPIE Proceedings Vol. 1410:
Solid State Lasers II
George Dube, Editor(s)

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