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Title: Laser-induced damage initiated on the surface of particle contamination fused silica at 1064nm

Abstract

An experimental study was undertaken to quantify the effects of contamination particles on the damage threshold of laser-illuminated fused silica optics and set cleanliness requirements for optics on the beam line of the National Ignition Facility at Lawrence Livermore National Laboratory. Circular contamination particles were sputter-deposited onto fused silica windows which were then illuminated repetitively using a 1064nm laser. A variety of contaminants were tested including metals, oxides, and organics. Tests were conducted with particles on the input and output surfaces of the window, and the morphological features of the damage were very reproducible. A plasma often ignited at the contamination particle; its intensity was dependent upon the mass of the contaminant. Input surface damage was characteristically more severe than output surface damage. The size of the damaged area scaled with the size of the particle. On a few occasions, catastrophic damage (cracking or ablation of the substrate) initiated on the output surface due to contamination particles on either the input or output surface. From damage growth plots, predictions can be made about the severity of damage expected from contamination particles of known size and material.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
302206
Report Number(s):
UCRL-LR-130583
ON: DE98058344; BR: DP0212000
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 1998
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; SILICA; SURFACE CONTAMINATION; SPUTTERING; LASER RADIATION; DAMAGE; WINDOWS; TESTING; US NATIONAL IGNITION FACILITY; OPTICAL EQUIPMENT

Citation Formats

Michlitsch, K J. Laser-induced damage initiated on the surface of particle contamination fused silica at 1064nm. United States: N. p., 1998. Web. doi:10.2172/302206.
Michlitsch, K J. Laser-induced damage initiated on the surface of particle contamination fused silica at 1064nm. United States. https://doi.org/10.2172/302206
Michlitsch, K J. 1998. "Laser-induced damage initiated on the surface of particle contamination fused silica at 1064nm". United States. https://doi.org/10.2172/302206. https://www.osti.gov/servlets/purl/302206.
@article{osti_302206,
title = {Laser-induced damage initiated on the surface of particle contamination fused silica at 1064nm},
author = {Michlitsch, K J},
abstractNote = {An experimental study was undertaken to quantify the effects of contamination particles on the damage threshold of laser-illuminated fused silica optics and set cleanliness requirements for optics on the beam line of the National Ignition Facility at Lawrence Livermore National Laboratory. Circular contamination particles were sputter-deposited onto fused silica windows which were then illuminated repetitively using a 1064nm laser. A variety of contaminants were tested including metals, oxides, and organics. Tests were conducted with particles on the input and output surfaces of the window, and the morphological features of the damage were very reproducible. A plasma often ignited at the contamination particle; its intensity was dependent upon the mass of the contaminant. Input surface damage was characteristically more severe than output surface damage. The size of the damaged area scaled with the size of the particle. On a few occasions, catastrophic damage (cracking or ablation of the substrate) initiated on the output surface due to contamination particles on either the input or output surface. From damage growth plots, predictions can be made about the severity of damage expected from contamination particles of known size and material.},
doi = {10.2172/302206},
url = {https://www.osti.gov/biblio/302206}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1998},
month = {Mon Jun 01 00:00:00 EDT 1998}
}