光学微环谐振腔的热非线性效应

微环谐振腔具有模式体积小、品质因子高、易于集成等优点,被广泛应用于光学混频、参量振荡、光梳及光孤子等非线性光学研究。如何将泵浦光能量耦合进微环谐振腔是激发非线性效应的关键所在。由于谐振条件下腔内光场能量显著增强,由此引发的热效应导致微环谐振腔的折射率与谐振波长发生改变,此改变又将反过来影响谐振腔内的能量大小。因此,对微环谐振腔热非线性效应的研究具有重要意义。基于以上原因,本文从微环谐振腔的温度、泵浦输入光功率的大小和泵浦输入光波长的扫描速率三个方面对一类具有高Q值的氮氧化硅微环谐振腔进行热非线性效应方面的研究。

Nonlinear effects in optical microring resonator

Microring resonator has many attractive features, including small mode volumes, high quality factors,easy integrations and so on, which is widely used in studying of a diverse set of nonlinear optical phenomena, such as optical mixing, optical parametric oscillation, optical frequency comb,dissipative solitons and others. How to couple pump power into microring resonator is the key for exciting the optical nonlinear effects. Because theenergy of the light field within the cavity is significantly enhanced under the resonant condition, the induced heating by absorption will change its refractive index, and thusthe resonant wavelength. The later will in turn change the power within the microring cavity. Therefore, it is of great importance to study the thermal nonlinear effects of microring resonator. In this paper, we characterize the nonlinear thermal effects of a silicon oxynitride microring resonatorwith a high-Q factor inSthreeSdifferent aspects, which include chip temperature, pump power and back and forth wavelength sweeping speeds.