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Phys Rev Lett. 2010 Apr 16;104(15):153901. Epub 2010 Apr 12.

Naturally phase-matched second-harmonic generation in a whispering-gallery-mode resonator.

Author information

1
Max Planck Institute for the Science of Light, Erlangen, Germany.

Abstract

We demonstrate for the first time natural phase matching for optical frequency doubling in a high-Q whispering-gallery-mode resonator made of lithium niobate. A conversion efficiency of 9% is achieved at 30 microW in-coupled continuous wave pump power. The observed saturation pump power of 3.2 mW is almost 2 orders of magnitude lower than the state-of-the-art value. This suggests an application of our frequency doubler as a source of nonclassical light requiring only a low-power pump, which easily can be quantum noise limited. Our theoretical analysis of the three-wave mixing in a whispering-gallery-mode resonator provides the relative conversion efficiencies for frequency doubling in various modes.

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