Large-area conditioning of optics for high-power laser systems

Sheehan, Lynn Matthew; Kozlowski, Mark R.; Rainer, F.; Staggs, M.

doi:10.1117/12.180939

Cited by 26 publications

(12 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Improvements in damage thresholds have routinely been observed in both coated optics such as high reflectors and in bulk material such as KDP when pre-conditioned with lower levels of laser irradiation below the unconditioned thresholds. 1,2 Similar tests were conducted on B 4 C-contaminated substrates. However, after a comparable number of highfluence shots we observed no decrease in the severity of laser damage compared to unconditioned sites.…”

Section: Test Sample Irradiationsmentioning

confidence: 99%

<title>Lifetime survivability of contaminated target-chamber optics</title>

et al. 1997

Self Cite

View full text Add to dashboard Cite

November 1996This 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 products, 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.Recycled Recyclable ABSTRACTTarget chambers used for Inertial Confinement Fusion (ICF) expose laser optics to a very hostile environment not only from high-fluence laser irradiation but also x-ray irradiation and particulate debris from targets and chamber wall materials. Expendable debris shields provide the first line of defense to more costly optics upstream in the laser beam path to contaminants generated within the target chamber. However, the replacement of a large number of debris shields is also an expensive proposition so that extending their usable lifetime within the chamber is of crucial importance.We have conducted tests to show that optics can both be cleaned and damaged by laser irradiation at 355␣nm after being contaminated with potential chamber-wall materials such as B 4 C and Al 2 O 3 . Such optics can survive from one to hundreds of laser shots depending on the degree of contamination and laser fluence levels. Similarly, we have studied the survivability of optics that have been exposed to direct contamination from representative target materials irradiated in the target chamber. We have also studied the effects on optics that were not directly exposed to targets yet received secondary exposure from the above directly-exposed samples.

show abstract

Section: Test Sample Irradiationsmentioning

confidence: 99%

<title>Lifetime survivability of contaminated target-chamber optics</title>

et al. 1997

Self Cite

View full text Add to dashboard Cite

show abstract

“…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%

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

Sheehan¹,

Hendrix

Battersby

et al. 1999

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The experimental results show that the damage threshold of HfO 2 /SiO 2 multilayer high reflective coating prepared by electron beam evaporation can be increased by 2 -3 times by using laser conditioning [6] [7] [8]. This also provides an essential foundation for the development of the ICF system.…”

mentioning

confidence: 99%

Study on Laser Conditioning Parameters of HfO<sub>2</sub>/SiO<sub>2</sub> Mul tilayer Mirrors

Dai¹,

Shi²,

Bao-jian³

et al. 2017

AMPC

View full text Add to dashboard Cite

Laser conditioning is an effective method to improve the laser damage threshold of HfO 2 /SiO 2 multilayer films prepared by electron beam evaporation. In this paper, some parameters that can affect the efficiency of laser conditioning were discussed. The result is that the maximum conditioning fluence should be less than 90% of its unconditioned laser induced damage threshold (LIDT) to avoid damage to the film. The laser beam increment between pulses and laser conditioning steps has a great influence on the improvement of damage threshold of HfO 2 /SiO 2 multilayer high reflective coatings. The coverage of the light intensity on the defect should be as wide as possible, and the irradiation of light intensity should be as high as possible. The main mechanisms of laser conditioning of HfO 2 /SiO 2 multilayer high reflective coatings may be the removal of Hf, Si and O ions and the removal of the defects in the films.

show abstract

Large-area conditioning of optics for high-power laser systems

Abstract: iiill iiiiiiiEi iiiiiii ii !ii!i iii ii iiiiii!iiiiiiiii!ii!iiiiiii i i!iiiiii i iii iiiiiiill iiii iiiii!iiiiiiiiiiiiiii i iiiiiii i iiii!!!iiiiiiiii!ii!iiiiiiii!i!ii il ii ii!i ii!i!iiiiiii!iiiii iiiiiiiiiiiiiii!i iii!iiiiiiii!iiiiiiii iiiii!!! i!iii!iliiiii!i!

Cited by 26 publications

References 6 publications

<title>Lifetime survivability of contaminated target-chamber optics</title>

<title>Lifetime survivability of contaminated target-chamber optics</title>

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

Study on Laser Conditioning Parameters of HfO<sub>2</sub>/SiO<sub>2</sub> Mul tilayer Mirrors

Contact Info

Product

Resources

About

Large-area conditioning of optics for high-power laser systems

Abstract: iiill iiiiiiiEi iiiiiii ii !ii!i iii ii iiiiii!iiiiiiiii!ii!iiiiiii i i!iiiiii i iii iiiiiiill iiii iiiii!iiiiiiiiiiiiiii i iiiiiii i iiii!!!iiiiiiiii!ii!iiiiiiii!i!ii il ii ii!i ii!i!iiiiiii!iiiii iiiiiiiiiiiiiii!i iii!iiiiiiii!iiiiiiii iiiii!!! i!iii!iliiiii!i!

Cited by 26 publications

References 6 publications

<title>Lifetime survivability of contaminated target-chamber optics</title>

<title>Lifetime survivability of contaminated target-chamber optics</title>

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

Study on Laser Conditioning Parameters of HfO&lt;sub&gt;2&lt;/sub&gt;/SiO&lt;sub&gt;2&lt;/sub&gt; Mul tilayer Mirrors

Contact Info

Product

Resources

About

Study on Laser Conditioning Parameters of HfO<sub>2</sub>/SiO<sub>2</sub> Mul tilayer Mirrors