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Optimizing pump threshold and conversion efficiency of whispering gallery optical parametric oscillators by controlled coupling

: Beckmann, Tobias; Buse, Karsten; Breunig, Ingo


Optics Letters 37 (2012), No.24, pp.5250-5252
ISSN: 0146-9592
Journal Article
Fraunhofer IPM ()
optical resonators; lithium niobate; parametric oscillators and amplifiers; microcavity

Threshold and efficiency of optical parametric oscillation in whispering gallery resonators have been predicted to depend strongly on the coupling strength. Our experiments, varying the coupling strength continuously over 3 orders of magnitude, confirm these predictions. The pump threshold changes by a factor of 20, allowing the adaptation of the system to a wide range of input powers. The minimum threshold of 0.20 mW occurs for significant pump undercoupling. The efficiency increases monotonically with coupling, spanning 4 orders of magnitude with a maximum efficiency of 30% in contact yielding output powers exceeding 1 mW.