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Phys Rev Lett. 2008 Aug 29;101(9):093902. Epub 2008 Aug 25.

Tunable optical frequency comb with a crystalline whispering gallery mode resonator.

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OEwaves Inc., 1010 East Union Street, Pasadena, California 91106, USA.


We report on the experimental demonstration of a tunable monolithic optical frequency comb generator. The device is based on four-wave mixing in a crystalline calcium fluoride whispering gallery mode resonator. The frequency spacing of the comb is given by an integer number of the free spectral range of the resonator. We select the desired number by tuning the frequency of the pumping laser with respect to the corresponding resonator mode. We also observe a rich variety of optical combs and high-frequency hyperparametric oscillation, depending on the experimental conditions. A potential application of the comb for generating tunable narrow band frequency microwave signals is demonstrated.

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