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Proceedings Paper

Design considerations for a 50-W cw, fundamental mode, diode-pumped solid state laser
Author(s): Robert J. Shine; Todd C. Merrill; Anthony J. Alfrey; Eric K. Gustafson; Robert L. Byer
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Paper Abstract

To achieve the design goal of 50 watts cw in a single-frequency, fundamental mode we have chosen a slab laser design. The slab geometry with a zig-zag optical path eliminates stress birefringence and thermal focusing to first order in a uniformly pumped, ideal slab. However, at the thermal loads we are considering, higher order effects become significant. We have developed a computer program to analyze the full three dimensional behavior of the thermally loaded slab and have used this code in an attempt to minimize the wavefront distortion of a beam as it traverses the slab. The resonator design is also critical in achieving single- frequency, fundamental mode operation with high extraction efficiency. Because of the rectangular geometry and size of the slab laser, we have chosen to build a stable-unstable resonator. Single frequency operation is obtained by injection locking a ring cavity. Mode selection is achieved in the wide transverse direction of the slab by using an unstable cavity with a super-Gaussian mirror. An unstable resonator supports large mode volumes and has large discrimination against higher order transverse modes. In addition, a super-Gaussian mirror profile provides efficient extraction in a high quality mode. Our resonator design should lead to efficient operation in a near TEM00 mode with a slope efficiency approaching those of slab lasers with multimode output.

Paper Details

Date Published: 16 June 1993
PDF: 11 pages
Proc. SPIE 1865, Diode Pumping of Average-Power Solid State Lasers, (16 June 1993); doi: 10.1117/12.146948
Show Author Affiliations
Robert J. Shine, Stanford Univ. (United States)
Todd C. Merrill, Stanford Univ. (United States)
Anthony J. Alfrey, Stanford Univ. (United States)
Eric K. Gustafson, Stanford Univ. (United States)
Robert L. Byer, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 1865:
Diode Pumping of Average-Power Solid State Lasers
Georg F. Albrecht; Raymond J. Beach; Stephan P. Velsko, Editor(s)

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