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Second-harmonic generation of light at 245 nm in a lithium tetraborate whispering gallery resonator

: Fürst, J.U.; Buse, K.; Breunig, I.; Becker, P.; Liebertz, J.; Bohatý, L.


Optics Letters 40 (2015), No.9, pp.1932-1935
ISSN: 0146-9592
Journal Article
Fraunhofer IPM ()

A millimeter-sized, monolithic whispering gallery resonator made of a lithium tetraborate, Li2B4O7, crystal was employed for doubly resonant second-harmonic generation with a continuous-wave laser source at 490 nm. An intrinsic quality factor of 2 x 10(8) was observed at the pump wavelength. A conversion efficiency of 2.2% was attained with 5.9 mW of mode-matched pump power. In the lithium tetraborate resonator, it is feasible to achieve phase-matching of second-harmonic generation for pump wavelengths between 486 and 506 nm.