A low-threshold solid-state UV laser using a whispering gallery mode (WGM) resonator constructed from UV transparent crystalline material is demonstrated. Using a resonator, we observe broad bandwidth lasing (280–330 nm) with a low threshold intensity of and an effective slope efficiency of . The lasing time delay dynamics in the pulsed operation mode are also observed and analyzed. Additionally, a WGM resonator with at 370 nm is realized. The combination of this high and the small WGM mode volume significantly lowers the pump power threshold compared to traditional cavity designs, opening the door for both tunable continuous-wave and mode-locked operation.
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