Opt Lett. 2018 Jun 1;43(11):2696-2699. doi: 10.1364/OL.43.002696.
Nonlinear optical effects have been studied extensively in microresonators as more photonics applications transitions to integrated on-chip platforms. Due to low optical losses and small mode volumes, microresonators are demonstrably the state-of-the-art platform for second-harmonic generation (SHG). However, the working bandwidth of such microresonator-based devices is relatively small, presenting a challenge for applications where a specifically targeted wavelength needs to be addressed. In this Letter, we analyze the phase-matching window and resonance wavelength with respect to varying microring widths, radii, and temperatures. A chip with precise design parameters was fabricated with phase matching realized at the exact wavelength of a two-photon transition of Rb85. This procedure can be generalized to any target pump wavelength in the telecom band with picometer precision.
非线性光学效应在微谐振器中得到了广泛的研究，因为更多的光子学应用正在向集成片上平台过渡。由于低光学损耗和小模式体积，微谐振器是二次谐波产生（SHG）的最先进平台。然而，这种基于微谐振器的器件的工作带宽相对较小，这对需要特定目标波长的应用提出了挑战。在这封信中，我们分析了不同微环宽度、半径和温度下的相匹配窗口和共振波长。我们制造了一个具有精确设计参数的芯片，在铷 85 的双光子跃迁的精确波长上实现了相匹配。该方法可以推广到电信波段中的任何目标泵浦波长，精度可达皮米。
