Tang Yulong, Gong Zheng, Liu Xianwen, Tang Hong X
Opt Lett. 2020 Mar 1;45(5):1124-1127. doi: 10.1364/OL.384317.
Here, we report $ {\chi ^{(3)}} $χ-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.
在此，我们报道了基于({\chi ^{(3)}})χ的光学参量振荡（OPO），其信号-闲频频率在由2μm泵浦的晶体氮化铝微环中被广泛分离。通过调整微环的宽度，实现了频率间隔为64.2太赫兹（THz）且延伸至电信和中红外波段的OPO。虽然通过改变微环宽度进行色散工程能够使OPO边带移动超过9太赫兹（THz），但通过改变泵浦波长和控制芯片温度，OPO频率也能够分别在1太赫兹和0.1太赫兹的范围内灵活调谐。在高泵浦功率下，OPO边带进一步演化为局域化频率梳线。这种具有灵活波长可调谐性的大频移OPO将带来增强的芯片级光源。
