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3 January 2019 Theoretical study of unstable resonators for diode-pumped alkali laser using wave optics simulation
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Proceedings Volume 11042, XXII International Symposium on High Power Laser Systems and Applications; 110420E (2019) https://doi.org/10.1117/12.2522115
Event: XXII International Symposium on High Power Laser Systems and Applications, 2018, Frascati, Italy
Abstract
Unstable optical resonators employing graded reflectivity mirrors (GRMs) for diode-pumped alkali laser (DPAL) are theoretically studied. In this study, a wave optics resonator model was coupled with a simplified gas flow model. The platform modeled was a 100-W class Cs DPAL proposed by us. As the pump beams are obliquely incident to the active medium, a wide gain region appears compared with that of the axially pumping scheme. Although an unstable resonator was expected to be suitable to provide a high-quality output beam, it was found to be inapplicable for our relatively small-scale DPAL apparatus. Instead, we demonstrated that the application of a GRM unstable resonator provide a nearly diffraction-limited beam (M2 < 2) with minimal penalty for the output power. The effect of the gas flow on the beam quality is also discussed.
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Masamori Endo, Ryuji Nagaoka, Hiroki Nagaoka, Toru Nagai, and Fumio Wani "Theoretical study of unstable resonators for diode-pumped alkali laser using wave optics simulation", Proc. SPIE 11042, XXII International Symposium on High Power Laser Systems and Applications, 110420E (3 January 2019); https://doi.org/10.1117/12.2522115
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