Multi-focus non-periodic scanning method for femtosecond lasers based on DMD and galvanometer scanners[Invited]  

作　　者：李华明 王雨 胡庆磊 张卓宇 吕晓华 曾绍群 Huaming Li;Yu Wang;Qinglei Hu;Zhuoyu Zhang;Xiaohua Lü;Shaoqun Zeng(Britton Chance Center for Biomedical Photonics,Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;MOE Key Laboratory for Biomedical Photonics,Collaborative Innovation Center for Biomedical Engineering,School of Engineering Sciences,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]Britton Chance Center for Biomedical Photonics,Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [2]MOE Key Laboratory for Biomedical Photonics,Collaborative Innovation Center for Biomedical Engineering,School of Engineering Sciences,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Optics Letters》2024年第5期89-94,共6页中国光学快报（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(No.2022YFC2404500);the National Natural Science Foundation of China(NSFC)(No.62075077);the Hubei Province Science and Technology Plan Project(No.2022BCA049).

摘　　要：Multi-focus parallel scanning can effectively increase laser fabrication throughput.However,the conventional approach of using a spatial light modulator(SLM)to generate multi-foci and scan this fixed number of foci with galvanometer scanners can only achieve a periodic scanning trajectory due to the low switching speed of the SLM.Here we demonstrate a multifocus non-periodic scanning method for femtosecond lasers by using,instead,a fast-switching digital micromirror device(DMD)to generate a dynamic number of foci.The number of effective foci is quickly switched by introducing aberration to the undesired focus.In this way,the intensity allocated to each focus will not be affected by the number of foci,and a uniformity of 98%with different numbers of foci is achieved without adjusting the total laser energy.Finally,we validate the effectiveness of this scanning method by demonstrating corneal flap fabrication of porcine cornea in vitro.

关 键 词：multi-focus non-periodic trajectory digital micromirror device aberration control corneal cutting 

分 类 号：TN249[电子电信—物理电子学]