31 January 2014 Whispering gallery optical parametric oscillators
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Whispering gallery optical parametric oscillators (WGR OPOs) are monolithic sources for tunable coherent and non-classical light. They are based on total internal reflection. Since reflection losses are negligible, their oscillation threshold can be far below one milliwatt. With sub-millimeter diameters, they are the most compact OPOs demonstrated so far. Recent experimental results demonstrate that WGR OPOs emit coherent light tunable over hundreds of nanometers. Operation in the visible as well as in the near-infrared has been demonstrated with up to 30 % conversion efficiency. These results indicate a great potential of WGR OPOs for spectroscopic and sensing applications.
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Ingo Breunig, Ingo Breunig, Karsten Buse, Karsten Buse, "Whispering gallery optical parametric oscillators", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89930B (31 January 2014); doi: 10.1117/12.2037727; https://doi.org/10.1117/12.2037727

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