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29 March 1996 Experimental and numerical studies of single-mode laser operation in unstable resonator with semitransparent output coupler and intracavity astigmatism
Pavel Anatolievich Mikheyev; Nikolay V. Kupryaev; Alexander Anatolievich Shepelenko
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Proceedings Volume 2702, Gas and Chemical Lasers; (1996) https://doi.org/10.1117/12.236897
Event: Photonics West '96, 1996, San Jose, CA, United States
Abstract
The possibility and conditions of single mode laser operation for lasers with resonator Fresnel number up to 10 and substantial intracavity astigmatism employing unstable resonator with uniform semitransparent output coupler (URUSC) have been investigated experimentally. The influence of astigmatism may be significant in multipass resonators with spherical folding mirrors. The experimental condition of single mode operation in URUSC was for the resonator to be in an unstable region if only for one plane of symmetry determined by astigmatism. At the same time in the other plane the resonator might be stable. Comparison of the far field measurements with numerical simulations was performed. It revealed that even if equivalent Fresnel number in `unstable plane' was greater than unit the laser operation was still single mode.
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Pavel Anatolievich Mikheyev, Nikolay V. Kupryaev, and Alexander Anatolievich Shepelenko "Experimental and numerical studies of single-mode laser operation in unstable resonator with semitransparent output coupler and intracavity astigmatism", Proc. SPIE 2702, Gas and Chemical Lasers, (29 March 1996); https://doi.org/10.1117/12.236897
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