Radiation mode structure of a laser unstable confocal cavity with additional feedback using a semitransparent plane mirror

V. I. Kislov; E. N. Ofitserov

doi:10.1117/12.2605748

2 December 2021 Radiation mode structure of a laser unstable confocal cavity with additional feedback using a semitransparent plane mirror

V. I. Kislov, E. N. Ofitserov

Author Affiliations +

Proceedings Volume 12086, XV International Conference on Pulsed Lasers and Laser Applications; 120860V (2021) https://doi.org/10.1117/12.2605748
Event: XV International Conference on Pulsed Lasers and Laser Applications, 2021, Tomsk, Russian Federation

Abstract

The main characteristics of a three-mirror laser resonator (mode selectivity, resonance radiation divergence) are theoretically investigated. The resonator cavity contains two spherical mirrors that make up an unstable confocal resonator, and one flat semitransparent mirror, which is located perpendicular to the unstable confocal resonator optical axis. A flat mirror returns part of the radiation into confocal resonator cavity. It is shown that the considered three-mirror optical system as a laser resonator combines the properties of both unstable and stable resonators. The intensity of the focused beam with a Fresnel number of ~10, which is formed by an optical transmitter with a three-mirror resonator, is ~10% higher than in the case of a system with a two-mirror resonator. The results of this work can be used in development of large-size lasers with a low-gain active medium.

Citation Download Citation

V. I. Kislov and E. N. Ofitserov "Radiation mode structure of a laser unstable confocal cavity with additional feedback using a semitransparent plane mirror", Proc. SPIE 12086, XV International Conference on Pulsed Lasers and Laser Applications, 120860V (2 December 2021); https://doi.org/10.1117/12.2605748

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