Max Planck Institute for the Science of Light, Erlangen, Germany.
Phys Rev Lett. 2010 Apr 16;104(15):153901. doi: 10.1103/PhysRevLett.104.153901. Epub 2010 Apr 12.
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.
我们首次在由铌酸锂制成的高品质 whispering-gallery-mode 谐振器中演示了光学倍频的自然相位匹配。在 30 μW 的连续波泵浦功率下，实现了 9%的转换效率。观察到的饱和泵浦功率为 3.2 mW，几乎比现有技术低 2 个数量级。这表明我们的倍频器可作为仅需低功率泵浦即可实现的非经典光源的应用，而这种泵浦很容易达到量子噪声极限。我们对 whispering-gallery-mode 谐振器中的三波混频的理论分析提供了各种模式下倍频的相对转换效率。
