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Highly tunable low-threshold optical parametric oscillation in radially poled whispering gallery resonators

: Beckmann, T.; Linnenbank, H.; Steigerwald, H.; Sturman, B.; Haertle, D.; Buse, K.; Breunig, I.

Fulltext urn:nbn:de:0011-n-1582722 (149 KByte PDF)
MD5 Fingerprint: 1a6efd25168d3c5b730ce35534529ab4
Created on: 4.2.2016

Physical review letters 106 (2011), No.14, Art. 143903, 4 pp.
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article, Electronic Publication
Fraunhofer IPM ()
nonlinear optics; optical parametric oscillation; radially poled lithium niobate disc; whispering gallery resonators; WGR

Whispering-gallery resonators (WGRs), based on total internal reflection, possess high quality factors in a broad spectral range. Thus, nonlinear-optical processes in such cavities are ideally suited for the generation of broadband or tunable electromagnetic radiation. Experimentally and theoretically, we investigate the tunability of optical parametric oscillation in a radially structured WGR made of lithium niobate. With a 1.04 µm pump wave, the signal and idler waves are tuned from 1.78 to 2.5 µm including the point of degeneracy by varying the temperature between 20 and 62 °C. Aweak off centering of the radial domain structure extends considerably the tuning capabilities. The oscillation threshold lies in themW-power range.