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Here, we report on the development of a diode-pumped single-frequency transition-metal-doped crystalline lasers designed in a miniature Fabry-Perot-type resonator by utilizing a narrow-bandwidth volume Bragg grating output coupler. Namely, single-longitudinal-mode operation was achieved from Ti:sapphire and Alexandrite lasers with a maximum output power of 570 mW and 275 mW near 813 nm and 780 nm, respectively. The mode-hop-free laser frequency tunability of up to 30 GHz was achieved by the cavity temperature and length variation with the Ti:sapphire system. The laser linewidth was measured to be in the 180 kHz range when locked to an external reference cavity transmission peak.
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Alexander A. Lagatsky, Gerald M. Bonner, Peter J. Schlosser, David J. M. Stothard, Loyd J. McKnight, "Highly-compact and power-scalable transition-metal-doped single-frequency lasers," Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices, 123990G (8 March 2023); https://doi.org/10.1117/12.2645876