Opt Lett. 2019 Mar 15;44(6):1492-1495. doi: 10.1364/OL.44.001492.
We demonstrate octave-spanning supercontinuum generation in unpoled lithium niobate waveguides, which are engineered to possess anomalous dispersion and pumped by a turn-key femtosecond laser centered at 1560 nm. Tunable dispersive waves and strong phase-matched second-harmonic generation are both observed by controlling the widths of the waveguides. The major features of the experimental spectra are reproduced by numerical modeling of the generalized nonlinear Schrödinger equation, which can be used to guide waveguide designs for tailoring the supercontinuum spectrum. Our results identify a path to a simple and integrable supercontinuum source in lithium niobate nanophotonic platform and will enable new capabilities in precision frequency metrology.
我们展示了在未极化的铌酸锂波导中产生的具有 8 个倍频程的超连续谱，这些波导经过工程设计，具有反常色散，并采用中心波长为 1560nm 的即用型飞秒激光器进行泵浦。通过控制波导的宽度，可以观察到可调谐的色散波和强相位匹配的二次谐波产生。实验光谱的主要特征通过广义非线性薛定谔方程的数值模拟得到再现，该方程可用于指导波导设计，以调整超连续谱。我们的结果确定了在铌酸锂纳米光子平台中实现简单且可集成的超连续光源的途径，并将为精密频率计量带来新的能力。
