Abstract
We report the first demonstration of a UV laser using a high-Q whispering gallery mode (WGM) resonator of Ce 3+ : LiCaAlF 6 . We show that WGM resonators from LiCaAlF 6 can achieve a Q of 2.6 x 10 7 at UV. We demonstrated a UV laser at 290 nm with a pulsed pump laser at 266 nm. The experiments showed the low pump threshold intensity of 7.5 x 10 9 W/m 2 and slope efficiency of 25%. We have also observed lasing delay dynamics. These results are consistent with our modeling and theoretical estimates, and pave the way for a low threshold cw UV laser using WGM resonator cavity.
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