Pulse-length dependence of the laser-induced damage behavior of a fused-silica antireflective metasurface
- University of Rochester, NY (United States)
A broadband, antireflective metasurface optic on a silica substrate is subjected to laser-induced damage-threshold measurements to quantify its performance under exposure to high-intensity/fluence laser pulses in the near-infrared at four pulse durations, ranging from 20 fs to 1.4 ns. The performance of the metasurface is benchmarked against that obtained from an equivalent bare fused-silica substrate that did not receive reactive-ion-etching metasurface treatment. Results showed that the damage threshold of the antireflective metasurface was always lower than the input-surface damage threshold of the untreated substrate. The damage initiations with nanosecond and picosecond pulses resulted in localized modification and removal of the nanostructures, whereas the onset of laser-induced modification with 20-fs pulses in a vacuum environment manifested as changes in the optical and electronic properties without significant material removal. The broader goal of this work is to develop a preliminary understanding of the laser-induced failure mechanisms of silica-based metasurface optics.
- Research Organization:
- University of Rochester, NY (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0004144
- OSTI ID:
- 2997980
- Journal Information:
- High Power Laser Science and Engineering, Journal Name: High Power Laser Science and Engineering Vol. 13; ISSN 2052-3289; ISSN 2095-4719
- Publisher:
- Cambridge University Press (CUP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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