Automated damage test facilities for materials development and production optic quality assurance at Lawrence Livermore National Laboratory

Battersby, Colin L.; Dickson, Richard K.; Jennings, Richard T.; Kimmons, James F.; Kozlowski, Mark R.; Maricle, Stephen M.; Mouser, Ron P.; Runkel, Michael J.; Schwartz, Sheldon; Sheehan, Lynn Matthew; Weinzapfel, Carolyn L.

doi:10.1117/12.344447

Cited by 11 publications

(5 citation statements)

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“…2.1 Rasterscan procedure BEAMS In the case of tests realized with small beams of few mm, we use principally what we call the "rasterscan" technique [1,2]. In this case, we move continuously the sample along the "x" axis in order to have a good overlapping of the beam, and step by step along the "y" axis (figure 1).…”

Section: Experimental Procedures On Small Samples With Mm-sizementioning

confidence: 99%

<title>Laser damage measurements on optics: from small to large beams, from samples to large aperture components</title>

et al. 2004

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The functional lifetime of large aperture optical components used in high power lasers, like LII and LMJ facilities, is mainly determined by laser damage measurements. We present experimental procedures and statistical analysis, made on small samples with mm-size beams, to determine damage densities and damage growth laws. The tests and analysis are compared to other results obtained with larger beams (few cm2) on large aperture components.

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Section: Experimental Procedures On Small Samples With Mm-sizementioning

confidence: 99%

<title>Laser damage measurements on optics: from small to large beams, from samples to large aperture components</title>

et al. 2004

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“…When using large optics, lifetime is limited by two different phenomena: damage initiation which represents the onset of damage for a given fluence on rare localized sites; and damage growth which is the tendency of damage to grow under iterative shots. Facing this limitation, the community involved nanosecond laser damage at 351nm for facilities such as NIF [7] or LMJ [1] developed the raster scan testing protocol to estimate damage initiation on meter scale optics [8,9]. Damage growth was studied to be able to predict damage size after a shot sequence [10,11]; damage mitigation technics were also proposed [12].…”

Section: Introductionmentioning

confidence: 99%

Sub-picosecond laser damage growth on high reflective coatings for high power applications

et al. 2017

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Growth of laser damage on High Reflection (HR) thin film coatings is investigated at the wavelength of 1.030µm in the sub-picosecond regime. An experimental laser damage setup in a pump / probe configuration is used to study the growth behavior of engineered damage sites as well as laser damage sites. Results demonstrate that engineered sites and laser damage sites grow identically which indicates that the growth phenomenon is intrinsic to materials and stack design. In order to analyze the experimental results, we have developed a numerical model to simulate growth. Using FEM simulations, we demonstrate that growth is governed by the evolution of the electric field distribution in the mirror stack under the successive laser shots, which is supported by time-resolved observations of damage growth events. Eventually the results are compared to laser damage observations made on of full scale PETAL mirrors, which fully support the approach.

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“…The fluence is determined using a commercial beam profiling system and represents the peak fluence in the beam as viewed at zero degrees incidence. Further explanation of the fluence measurement can also be found in other references (1) . Note that the two damage test facilities have different pulse lengths.…”

Section: Fluence Determinationmentioning

confidence: 99%

“…The systems and procedures for damage measurements at LLNL are well documented (1)(2)(3) . The small optics testing procedure is specific enough to warrant some further explanation.…”

Section: Damage Testing Procedurementioning

confidence: 99%

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<title>National Ignition Facility small optics laser-induced damage and photometry measurements program</title>

Sheehan¹,

Hendrix

Battersby

et al. 1999

SPIE Proceedings

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July 1999This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. National Ignition Facility Small Optics Laser-Induced Damage and Photometry Measurements ProgramLynn Sheehan*, James L. Hendrix**, Colin Battersby*, Stan Oberhelman* University of California Abstract:The National Ignition Facility will require upwards of 25,000 small optical components in its various beam conditioning and diagnostic packages. A quality control program designed to ensure that the elements meet the required specifications will test these optical elements. For many of the components, damage performance is one of the critical specifications, which will require state-of-the-art performance from the industry participants. A program was initiated to understand the current performance level of such optics. The results of this study as it pertains to laser-induced damage is shown. The use of ratio reflectometry is also addressed as the method of choice for photometry measurements on these industry supplied optics.

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Automated damage test facilities for materials development and production optic quality assurance at Lawrence Livermore National Laboratory

Cited by 11 publications

References 0 publications

<title>Laser damage measurements on optics: from small to large beams, from samples to large aperture components</title>

<title>Laser damage measurements on optics: from small to large beams, from samples to large aperture components</title>

Sub-picosecond laser damage growth on high reflective coatings for high power applications

<title>National Ignition Facility small optics laser-induced damage and photometry measurements program</title>

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