Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.143903
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Funding
- DFG
- Deutsche Telekom AG
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Whispering-gallery resonators (WGR's), 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 mu m pump wave, the signal and idler waves are tuned from 1.78 to 2: 5 mu m-including the point of degeneracy-by varying the temperature between 20 and 62 degrees C. Aweak off centering of the radial domain structure extends considerably the tuning capabilities. The oscillation threshold lies in the mW-power range.
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