Theoretical study of unstable resonators for diode-pumped alkali laser using wave optics simulation

Masamori Endo; Ryuji Nagaoka; Hiroki Nagaoka; Toru Nagai; Fumio Wani

doi:10.1117/12.2522115

3 January 2019 Theoretical study of unstable resonators for diode-pumped alkali laser using wave optics simulation

Masamori Endo, Ryuji Nagaoka, Hiroki Nagaoka, Toru Nagai, Fumio Wani

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.

Citation Download Citation

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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