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Proceedings Paper

Evanescent coupling alternatives for YAG lasers
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Paper Abstract

Diffraction gratings are proposed as an alternative technique to couple a laser diode pump beam into the YAG crystal of a solid-state laser. These binary diffraction gratings are on the long axis of the crystal and are etched in high refractive index coating material. The paper reveals the set of grating parameters and tolerances for transforming vertically incident light into horizontally propagating light inside the crystal with theoretical efficiencies of more than 90%. Under optimal conditions the diffraction grating behaves like an excellent leaky waveguide structure. Theoretical comparisons are made between the efficiencies of gratings directly etched into the laser crystal and gratings etched in to a high index coating material. The resulting zig-zag pumped laser cavity is uniformly excited in order to minimize thermal loads and lensing effects. The maskless binary sub-micron pattern transfer is realized by combining interferometry and lithography.

Paper Details

Date Published: 14 April 2000
PDF: 8 pages
Proc. SPIE 3929, Solid State Lasers IX, (14 April 2000); doi: 10.1117/12.382754
Show Author Affiliations
Johan H. Stiens, Vrije Univ. Brussel (Belgium)
Roger A. Vounckx, Vrije Univ. Brussel (Belgium)
Michele Ruggiero Banish, MEMS Optical LLC (United States)
Rodney L. Clark, MEMS Optical LLC (United States)

Published in SPIE Proceedings Vol. 3929:
Solid State Lasers IX
Richard Scheps, Editor(s)

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