Opt Express. 2022 Nov 21;30(24):43566-43578. doi: 10.1364/OE.471574.
We introduce the optical vortex beam into simultaneous spatial and temporal focusing (SSTF) technique, and theoretically and experimentally demonstrate the local control of peak intensity distribution at the focus of a simultaneous spatiotemporally focused optical vortex (SSTF OV) beam. To avoid nonlinear self-focusing in the conventional focusing scheme, a spatiotemporally focused femtosecond laser vortex beam was employed to achieve doughnut-shaped ablation and high aspect ratio (∼28) microchannels on the back surface of 3 mm thick soda-lime glass and fused silica substrates.
我们将光学涡旋光束引入到同时空间和时间聚焦（SSTF）技术中，并从理论和实验上证明了同时空间时间聚焦的光学涡旋光束（SSTF OV）焦点处的峰值强度分布的局域控制。为了避免传统聚焦方案中的非线性自聚焦，我们采用了同时空间时间聚焦的飞秒激光涡旋光束在 3 毫米厚的钠钙玻璃和熔融石英基底的背面实现了环形烧蚀和高纵横比（~28）的微通道。
