A scalable pumping method for a diode-pumped alkali laser (DPAL) is proposed. In the past, pump beams were collinearly or transversely arranged to the optical axis of the optical resonator. In our proposal, pump sources are circularly arranged around the optical axis, and the pump beams irradiate the gain cell at a small (0.1 radians) angle from the optical axis. Tens of pump beams can be coupled to the gain medium with high circular symmetry and high coupling efficiency. The idea was verified by numerical simulation, and the results were validated by experimental investigation.
Masamori Endo, Ryuji Nagaoka, Hiroki Nagaoka, Toru Nagai, and Fumio Wani, "Scalable pump beam arrangement for diode pumped alkali lasers," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130K (Presented at SPIE LASE: January 31, 2018; Published: 20 February 2018); https://doi.org/10.1117/12.2287053.
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