Sun Wenqing, Liu Fengqin, Guan Jing, Liu Yi, Romero Carolina, Vázquez de Aldana Javier R, Jia Yuechen, Sun Xiaoli, Chen Feng
Opt Express. 2025 Jan 27;33(2):1749-1759. doi: 10.1364/OE.540104.
Dielectric waveguides are widely recognized as excellent and versatile components for integrated multifunctional photonic chips, thanks to their strong optical confinement capabilities. In this study, we present a novel semi-tapered depressed-cladding waveguide structure, designed and fabricated using femtosecond laser direct writing technology. The optical guiding performance of this semi-tapered waveguide is systematically analyzed by characterizing its loss characteristics. Leveraging the high gain and superior laser performance of the semi-tapered waveguide platform, we successfully demonstrate an efficient vortex waveguide laser. Moreover, we achieve a stable Q-switched vortex laser with short pulse duration and high repetition rate by utilizing an SbTe thin film as a saturable absorber. This work exemplifies the potential for developing three-dimensional waveguides for on-chip integrated pulsed lasers.
由于具有强大的光限制能力，介质波导被广泛认为是集成多功能光子芯片的优秀且通用的组件。在本研究中，我们展示了一种新颖的半锥形凹陷包层波导结构，它是使用飞秒激光直写技术设计和制造的。通过表征其损耗特性，系统地分析了这种半锥形波导的光导性能。利用半锥形波导平台的高增益和卓越的激光性能，我们成功演示了一种高效的涡旋波导激光器。此外，通过使用SbTe薄膜作为可饱和吸收体，我们实现了具有短脉冲持续时间和高重复率的稳定调Q涡旋激光器。这项工作例证了开发用于片上集成脉冲激光器的三维波导的潜力。
