McMillen Ben, Li Mingshan, Huang Sheng, Zhang Botao, Chen Kevin P
Opt Lett. 2014 Jun 15;39(12):3579-82. doi: 10.1364/OL.39.003579.
Bragg waveguides are fundamental components in photonic integrated circuits and are particularly interesting for mid-IR applications in high index, highly nonlinear materials. In this work, we present Bragg waveguides fabricated in bulk chalcogenide glass using an ultrafast laser. Waveguides with near circularly symmetric cross sections and low propagation loss are obtained through spatial and temporal beam shaping. Using a single-pass technique, the waveguide and Bragg structure are formed at the same time. First through sixth order gratings with strengths of up to 25 dB are realized, and performance is evaluated based on the modulation duty cycle of the writing beam.
布拉格波导是光子集成电路中的基本元件，对于在高折射率、高非线性材料中的中红外应用尤为重要。在这项工作中，我们展示了使用超快激光在块状硫系玻璃中制造的布拉格波导。通过空间和时间光束整形获得了具有近圆形对称横截面和低传播损耗的波导。使用单程技术，同时形成波导和布拉格结构。实现了强度高达25 dB的一阶到六阶光栅，并根据写入光束的调制占空比评估性能。
