A 172 mJ,high-energy picosecond 355 nm ultraviolet laser system at 100 Hz  

作　　者：Jiatong Li Jiayu Zhang Tiejun Ma Yongping Yao Runze Liang Xue Zhou Chunyan Jia Shengjun Huang Hongkun Nie Bo Yao Jingliang He Baitao Zhang 

机构地区：[1]Institute of Novel Semiconductors,State Key Laboratory of Crystal Materials,Shandong University,Jinan,China [2]Key Laboratory of Laser&Infrared System,Ministry of Education,Shandong University,Qingdao,China

出　　处：《High Power Laser Science and Engineering》2024年第5期123-130,共8页高功率激光科学与工程(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.62275144,62105182 and 62322509);the Natural Science Foundation of Shandong Province(No.ZR2021QF082);the Youth Cross Innovation Group of Shandong University(No.2020QNQT);the Distinguished Young Scholars from Shandong University。

摘　　要：A high-energy picosecond 355 nm ultraviolet(UV)laser operating at 100 Hz was demonstrated.A 352 mJ,69 ps1064 nm laser at 100 Hz was realized firstly by cascaded regenerative,laser diode end-pumped single-pass and side-pumped main amplifiers.The stimulated Raman scattering-based beam shaping technique,thermally induced birefringence compensation and 4f spatial filter-image relaying systems were used to maintain a relatively homogeneous beam intensity distribution during the amplification process.By using lithium triborate crystals for second-and thirdharmonic generation(THG),a 172 mJ,approximately 56 ps,355 nm UV laser was achieved with a THG conversion efficiency of 49%.To the best of our knowledge,it is the highest pulse energy of a picosecond 355 nm UV laser so far.The beam quality factor M^(2)and pulse energy stability were M_(x)^(2)=3.92,M_(y)^(2)=3.71 and root mean square of1.48%@3 hours.This laser system could play significant roles in applications including photoconductive switch excitation,laser drilling and laser micro-fabrication.

关 键 词：355 nm ultraviolet lasers picosecond lasers solid-state laser 

分 类 号：TN2[电子电信—物理电子学]