AUTHOR=Bai Zhenao , Zhang Yakai , Lin Weiran , Yan Xiaochao , Fan Zhongwei 

TITLE=High Stability Industrial-Grade Nd: YVO4 Picosecond Laser Amplifier With High Average Output Power

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.876222

DOI=10.3389/fphy.2022.876222

ISSN=2296-424X

ABSTRACT=<p>We demonstrate a high-power Nd: YVO<sub>4</sub> picosecond laser amplifier that is capable of generating 51.5 W of average output power at a wavelength of 1,064 nm, with a repetition rate of 70 MHz and a pulse duration of 8.5 ps. This system encompasses three stages of laser diode end-pumped Nd: YVO<sub>4</sub> amplification including two double-pass amplifiers and a single-pass amplifier. Laser output with near-diffraction-limited beam quality (<italic>M</italic><sup>2</sup> &lt; 1.1) was maintained throughout the entire power scaling range of the laser. The system exhibited very high output power stability with a root-mean-square amplitude fluctuation of less than 0.2% over a period of 15 h of continuous operation.</p>