标题： 高折射率掺杂二氧化硅光子集成电路在不同泵浦设置下的超连续谱生成 显示英文标题

标题： Supercontinuum generation in high-index doped silica photonic integrated circuits under diverse pumping settings

摘要： 近年来，超连续光生成的进展非常显著，特别是在高度非线性光子集成电路波导的背景下。 在本研究中，我们全面研究了高折射率掺杂二氧化硅玻璃集成电路波导中的超连续光（SC）生成，探讨了各种飞秒泵浦波长和输入偏振状态。 当在1200纳米、1300纳米和1550纳米的异常色散区域进行泵浦时，我们展示了从700纳米到2400纳米的宽频带SC生成。 相比之下，在1000纳米的正常色散区域进行泵浦会导致较窄的SC光谱，这主要是由于自相位调制和光波破裂等相干非线性效应。 此外，我们研究了TE/TM偏振模式对SC生成的影响，揭示了展宽过程的偏振依赖特性。 此外，拉曼散射测量显示，在拉曼增益曲线中出现了两个新的峰，分别位于48.8 THz和75.1 THz。 我们的实验结果得到了基于包含新拉曼增益贡献的广义非线性薛定谔方程的数值模拟的支持。 最后，使用色散傅里叶变换技术进行的相对强度噪声测量表明生成的SC光谱具有极好的稳定性。 显示英文摘要

摘要： Recent advances in supercontinuum light generation have been remarkable, particularly in the context of highly nonlinear photonic integrated waveguides. In this study, we thoroughly investigate supercontinuum (SC) generation in high-index doped silica glass integrated waveguides, exploring various femtosecond pumping wavelengths and input polarization states. We demonstrate broadband SC generation spanning from 700 nm to 2400 nm when pumping within the anomalous dispersion regime at 1200 nm, 1300 nm, and 1550 nm. In contrast, pumping within the normal dispersion regime at 1000 nm results in narrower SC spectra, primarily due to coherent nonlinear effects such as self-phase modulation and optical wave breaking. Additionally, we examine the impact of TE/TM polarization modes on SC generation, shedding light on the polarization-dependent characteristics of the broadening process. Moreover, Raman scattering measurements reveal the emergence of two new peaks at 48.8 THz and 75.1 THz in the Raman gain curve. Our experimental results are supported by numerical simulations based on a generalized nonlinear Schrodinger equation that incorporates the new Raman gain contribution. Finally, relative intensity noise measurements conducted using the dispersive Fourier transform technique indicate excellent stability of the generated SC spectra.