Frontiers in Physics (Oct 2022)

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

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

DOI
https://doi.org/10.3389/fphy.2022.981024
Journal volume & issue
Vol. 10

Abstract

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High-repetition rate laser-induced damage of Ta2O5:SiO2 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.

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