Amako Jun, Nakano Hidetoshi
Appl Opt. 2018 Jan 1;57(1):33-41. doi: 10.1364/AO.57.000033.
We report a cascade optical system for multifocusing ultrashort pulse beams, particularly sub-50-fs pulses. System achromaticity is key to simultaneous compensation of the spatio-temporal pulse distortions. In this system, diffractive and refractive subsystems are optically coupled in cascade to correct chromatic aberrations, which are the primary cause of pulse distortion. We design a prototype system by applying achromatic conditions derived from an ABCD matrix analysis. The designed system is then evaluated using 20-fs pulses, by characterizing the transmitted pulses in terms of beam width and pulse duration; hence, the proposed distortion compensation scheme is validated. This pulse delivery system enables damage-free and high-throughput materials processing using ultrashort pulses.
我们报道了一种用于多聚焦超短脉冲光束，特别是亚50飞秒脉冲的级联光学系统。系统消色差对于同时补偿时空脉冲畸变至关重要。在该系统中，衍射子系统和折射子系统以级联方式进行光学耦合，以校正色差，色差是脉冲畸变的主要原因。我们通过应用基于ABCD矩阵分析得出的消色差条件来设计一个原型系统。然后使用20飞秒脉冲对设计的系统进行评估，通过表征透射脉冲的光束宽度和脉冲持续时间；因此，所提出的畸变补偿方案得到了验证。这种脉冲传输系统能够使用超短脉冲进行无损伤且高通量的材料加工。
