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Proceedings Paper

Geometric modes of an unstable ring resonator with 90 degree beam rotation
Author(s): Paul K. Kennedy; Kenneth C. Sun
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Paper Abstract

An unstable ring resonator design which produces 90 deg beam rotation in a single pass (UR90 or HiQ) has been developed in order to solve the problem of obtaining an unobscured, near diffraction-limited output beam from low-gain laser media requiring saturation of a large transverse gain volume. A computer code was used to model the bare-cavity geometric modes of the UR90 by ray tracing through an equivalent thin lens resonator. Mode footprints of the collimated forward mode and expanding reverse mode showed only partial overlap, indicating that proper aperturing, especially at the gain generator, can aid in reverse mode suppression.

Paper Details

Date Published: 1 June 1990
PDF: 9 pages
Proc. SPIE 1224, Optical Resonators, (1 June 1990); doi: 10.1117/12.18434
Show Author Affiliations
Paul K. Kennedy, Rockwell International Corp. (United States)
Kenneth C. Sun, Rockwell International Corp. (United States)


Published in SPIE Proceedings Vol. 1224:
Optical Resonators
Dale A. Holmes, Editor(s)

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