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

A millimeter-sized, monolithic whispering gallery resonator made of a lithium tetraborate, Li sub(2) B sub(4) O sub(7), crystal was employed for doubly resonant second-harmonic generation with a continuous-wave laser source at 490 nm. An intrinsic quality factor of 2x10 super(8) was observed at the...

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Bibliographic Details
Published in:Optics letters 2015-05, Vol.40 (9), p.1932-1935
Main Authors: Furst, Josef U, Buse, Karsten, Breunig, Ingo, Becker, Petra, Liebertz, Josef, Bohaty, Ladislav
Format: Article
Language:English
Subjects:
Conversion
Crystals
Galleries
Lasers
Lithium tetraborate
Pumps
Resonators
Wavelengths
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Summary:A millimeter-sized, monolithic whispering gallery resonator made of a lithium tetraborate, Li sub(2) B sub(4) O sub(7), crystal was employed for doubly resonant second-harmonic generation with a continuous-wave laser source at 490 nm. An intrinsic quality factor of 2x10 super(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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.001932