Abstract

Multi-beam laser processing is a very popular method to improve processing efficiency. For this purpose, a compact and stable multi-beam pulsed 355 nm ultraviolet (UV) laser based on a micro-lens array (MLA) is presented in this Letter. It is worth noting that the MLA is employed to act as the spatial splitter as well as the coupling lens. With assistance of the MLA, the 1064 nm laser and 532 nm laser are divided into four sub-beams and focused at different areas of the third-harmonic generation (THG) crystal. As a result, the multi-beam pulsed 355 nm UV laser is successfully generated inside the THG crystal. The measured pulse widths of four sub-beams are shorter than 9 ns. Especially, the generated four sub-beams have good long-term power stability benefitting from the employed MLA. We believe that the generated stable multi-beam 355 nm UV laser can meet the requirement of high-efficiency laser processing, and the presented method can also pave the way to generate stable and long-lived multi-beam UV lasers.

© 2022 Chinese Laser Press

Picosecond high-power 355-nm UV generation in CsLiB₆O₁₀ crystal

Kentaro Ueda, Yosuke Orii, Yoshinori Takahashi, George Okada, Yusuke Mori, and Masashi Yoshimura
Opt. Express 24(26) 30465-30473 (2016)

Stable, high-power, Yb-fiber-based, picosecond ultraviolet generation at 355 nm using BiB₃O₆

S. Chaitanya Kumar, E. Sanchez Bautista, and M. Ebrahim-Zadeh
Opt. Lett. 40(3) 403-406 (2015)

High-power picosecond 355  nm laser based on La₂CaB₁₀O₁₉ crystal

Kai Li, Ling Zhang, Degang Xu, Guochun Zhang, Haijuan Yu, Yuye Wang, Faxian Shan, Lirong Wang, Chao Yan, Yicheng Wu, Xuechun Lin, and Jianquan Yao
Opt. Lett. 39(11) 3305-3307 (2014)

High-power high-repetition-rate UV light at 355 nm generated by a diode-end-pumped passively Q-switched Nd:YAG laser

Fu-qiang Jia, Quan Zheng, Qing-hua Xue, Yi-kun Bu, and Long-sheng Qian
Appl. Opt. 46(15) 2975-2979 (2007)

High peak-power near-MW laser pulses by third harmonic generation at 355 nm in Ca₅(BO₃)₃F nonlinear single crystals

Florent Cassouret, Arvydas Kausas, Vincent Yahia, Gérard Aka, Pascal Loiseau, and Takunori Taira
Opt. Express 28(7) 10524-10530 (2020)