AUTHOR=Zhang Mingxiao , Qiu Fumin , Qiao Zhao , Zhou Qiang , Pu Yunti , Xiong Bingcheng , Die Junhui , Lv Liang , Ma Ping 

TITLE=High-repetition rate picosecond laser-induced damage properties of Ta2O5:SiO2 coatings

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.981024

DOI=10.3389/fphy.2022.981024

ISSN=2296-424X

ABSTRACT=<p>High-repetition rate laser-induced damage of Ta<sub>2</sub>O<sub>5</sub>:SiO<sub>2</sub> coatings was investigated at 355 nm wavelength and a repetition rate of 30 kHz. Laser-induced damage thresholds of coatings with different mixture ratios were measured. The relationships between laser-induced damage threshold and the material band gap and defect absorption were analyzed. Laser-induced damage threshold decreased with increase in number of laser pulses owing to enhancement of the absorption. Enhancement of absorption is attributed to the increase in density of mid-state defects induced by the picosecond laser pulses. The relationship between mid-state defects and the material mixture ratio was also analyzed.</p>