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Title: Role of defects in laser-induced modifications of silica coatings and fused silica using picosecond pulses at 1053 nm: II Scaling laws and the density of precursors

Abstract

Here, we investigate the role of defects in laser-induced damage of fused silica and of silica coatings produced by e-beam and PIAD processes which are used in damage resistant, multi-layer dielectric, reflective optics. We perform experiments using 1053 nm, 1–60 ps laser pulses with varying beam size, number of shots, and pulse widths in order to understand the characteristics of defects leading to laser-induced damage. This pulse width range spans a transition in mechanisms from intrinsic material ablation for short pulses to defect-dominated damage for longer pulses. We show that for pulse widths as short as 10 ps, laser-induced damage properties of fused silica and silica films are dominated by isolated absorbers. The density of these precursors and their fluence dependence of damage initiation suggest a single photon process for initial energy absorption in these precursors. Higher density precursors that initiate close to the ablation threshold at shorter pulse widths are also observed in fused silica, whose fluence and pulse width scaling suggest a multiphoton initiation process. We also show that these initiated damage sites grow with subsequent laser pulses. We show that scaling laws obtained in more conventional ways depend on the beam size and on the definition ofmore » damage for ps pulses. For this reason, coupling scaling laws with the density of precursors are critical to understanding the damage limitations of optics in the ps regime.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1399755
Report Number(s):
LLNL-JRNL-726943
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 13; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Laurence, T. A., Negres, R. A., Ly, S., Shen, N., Carr, C. W., Alessi, D. A., Rigatti, A., and Bude, J. D. Role of defects in laser-induced modifications of silica coatings and fused silica using picosecond pulses at 1053 nm: II Scaling laws and the density of precursors. United States: N. p., 2017. Web. doi:10.1364/OE.25.015381.
Laurence, T. A., Negres, R. A., Ly, S., Shen, N., Carr, C. W., Alessi, D. A., Rigatti, A., & Bude, J. D. Role of defects in laser-induced modifications of silica coatings and fused silica using picosecond pulses at 1053 nm: II Scaling laws and the density of precursors. United States. https://doi.org/10.1364/OE.25.015381
Laurence, T. A., Negres, R. A., Ly, S., Shen, N., Carr, C. W., Alessi, D. A., Rigatti, A., and Bude, J. D. Thu . "Role of defects in laser-induced modifications of silica coatings and fused silica using picosecond pulses at 1053 nm: II Scaling laws and the density of precursors". United States. https://doi.org/10.1364/OE.25.015381. https://www.osti.gov/servlets/purl/1399755.
@article{osti_1399755,
title = {Role of defects in laser-induced modifications of silica coatings and fused silica using picosecond pulses at 1053 nm: II Scaling laws and the density of precursors},
author = {Laurence, T. A. and Negres, R. A. and Ly, S. and Shen, N. and Carr, C. W. and Alessi, D. A. and Rigatti, A. and Bude, J. D.},
abstractNote = {Here, we investigate the role of defects in laser-induced damage of fused silica and of silica coatings produced by e-beam and PIAD processes which are used in damage resistant, multi-layer dielectric, reflective optics. We perform experiments using 1053 nm, 1–60 ps laser pulses with varying beam size, number of shots, and pulse widths in order to understand the characteristics of defects leading to laser-induced damage. This pulse width range spans a transition in mechanisms from intrinsic material ablation for short pulses to defect-dominated damage for longer pulses. We show that for pulse widths as short as 10 ps, laser-induced damage properties of fused silica and silica films are dominated by isolated absorbers. The density of these precursors and their fluence dependence of damage initiation suggest a single photon process for initial energy absorption in these precursors. Higher density precursors that initiate close to the ablation threshold at shorter pulse widths are also observed in fused silica, whose fluence and pulse width scaling suggest a multiphoton initiation process. We also show that these initiated damage sites grow with subsequent laser pulses. We show that scaling laws obtained in more conventional ways depend on the beam size and on the definition of damage for ps pulses. For this reason, coupling scaling laws with the density of precursors are critical to understanding the damage limitations of optics in the ps regime.},
doi = {10.1364/OE.25.015381},
journal = {Optics Express},
number = 13,
volume = 25,
place = {United States},
year = {Thu Jun 22 00:00:00 EDT 2017},
month = {Thu Jun 22 00:00:00 EDT 2017}
}

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Works referencing / citing this record:

Laser-induced modifications of HfO 2 coatings using picosecond pulses at 1053 nm: Using polarization to isolate surface defects
journal, August 2018

  • Laurence, Ted A.; Negres, Raluca A.; Feigenbaum, Eyal
  • Journal of Applied Physics, Vol. 124, Issue 8
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Implications of laser beam metrology on laser damage temporal scaling law for dielectric materials in the picosecond regime
journal, July 2019

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