Here, we report $ {\chi ^{(3)}} $χ(3)-based optical parametric oscillation (OPO) with widely separated signal-idler frequencies from crystalline aluminum nitride microrings pumped at $ 2\,\,\unicode{x00B5}{\rm m} $2µm. By tailoring the width of the microring, OPO reaching toward the telecom and mid-infrared bands with a frequency separation of 64.2 THz is achieved. While dispersion engineering through changing the microring width is capable of shifting the OPO sideband by $ \gt {9}\;{\rm THz}$>9THz, the OPO frequency can also be agilely tuned in the ranges of 1 and 0.1 THz, respectively, by shifting the pump wavelength and controlling the chip's temperature. At high pump powers, the OPO sidebands further evolve into localized frequency comb lines. Such large-frequency-shift OPO with flexible wavelength tunability will lead to enhanced chip-scale light sources.

中文翻译：

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AlN微环中的广泛分离的光学Kerr参数振荡。

在这里，我们报告基于$ {\ chi ^ {（3）}}基于$χ（3）的光参量振荡（OPO），其信号空闲频率与以2 、、 {x00B5} {\ rm m} $ 2µm。通过调整微环的宽度，可以实现以64.2 THz的频率间隔到达电信和中红外波段的OPO。尽管通过更改微环宽度进行色散工程设计可以使OPO边带移动$ \ gt {9} \; {\ rm THz} $> 9THz，但OPO频率也可以在1到0.1 THz的范围内灵活调整，分别通过改变泵浦波长和控制芯片温度来实现。在高泵浦功率下，OPO边带会进一步演变为局部频率梳状线。