Vijayakumar Surendar, Vyas Kaustubh, Espinosa Daniel H G, Reshef Orad, Song Meiting, Awan Kashif Masud, Choudhary Saumya, Cardenas Jaime, Boyd Robert W, Dolgaleva Ksenia
Institute of Optics, University of Rochester, 480 Intercampus Dr, Rochester, NY 14627, USA.
School of Electrical Engineering and Computer Science, University of Ottawa, 800 King Edward Ave., Ottawa, ON, K1N 6N5, Canada.
Nanophotonics. 2024 May 31;13(18):3385-3393. doi: 10.1515/nanoph-2024-0120. eCollection 2024 Aug.
Third-harmonic generation (THG) in silicon nitride waveguides is an ideal source of coherent visible light, suited for ultrafast pulse characterization, telecom signal monitoring and self-referenced comb generation due to its relatively large nonlinear susceptibility and CMOS compatibility. We demonstrate third-harmonic generation in silicon nitride waveguides where a fundamental transverse mode at 1,596 nm is phase-matched to a TM mode at 532 nm, confirmed by the far-field image. We experimentally measure the waveguide width-dependent phase-matched wavelength with a peak-power-normalized conversion efficiency of 5.78 × 10 %/W over a 660-μm-long interaction length.
氮化硅波导中的三次谐波产生（THG）是一种理想的相干可见光光源，由于其相对较大的非线性极化率和CMOS兼容性，适用于超快脉冲表征、电信信号监测和自参考梳状波产生。我们展示了氮化硅波导中的三次谐波产生，其中1596nm的基横模与532nm的TM模相位匹配，这一点通过远场图像得到了证实。我们通过实验测量了与波导宽度相关的相位匹配波长，在660μm长的相互作用长度上，峰值功率归一化转换效率为5.78×10%/W。
