Large Area Laser Conditioning of Dielectric Thin Film Mirrors

Kozlowski,; Wolfe, C. Robert; Staggs, M.; Campbell, John R.

doi:10.1520/stp26505s

Cited by 25 publications

(25 citation statements)

References 22 publications

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“…This agrees with previous experimental studies reporting that initial low fluence illumination or laser conditioning can improve the damage threshold. 32,33 This study also suggests that from a functional damage improvement standpoint, multiple step conditioning could be replaced by a single step conditioning process.…”

Section: 31mentioning

confidence: 88%

<title>Growth of laser-induced damage during repetitive illumination of HfO2/SiO2 multilayer mirror and polarizer coatings</title>

1997

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Lawrence Livermore National Laboratory, Laser Materials Department, Livermore, California 94550. ABSTRACTAs designers want to increase the peak fluence of high power laser, it becomes necessary to tolerate some damage on mirrors and polarizers. To quantify how the different types of damage morphologies initiate and grow during repetitive illumination, hafnia-silica multilayer mirror and polarizer coatings were laser damage tested. The coatings were prepared by e-beam evaporation and irradiated with a 3-ns-pulse at 1064 nm.The morphology of laser-induced damage was recorded after each shot to determine the types of damage that cause massive unstable failure and lower the optic's functional damage threshold. The results of the tests were summarized on damage stability maps plotting the average damage size as a function of the number of shots for fluences ranging from 10 to 40 J/cm The results show that the delaminate damage morphology should be prevented. This knowledge has allowed coatings development efforts to focus on eliminating the origin of such damage morphology.

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Section: 31mentioning

confidence: 88%

<title>Growth of laser-induced damage during repetitive illumination of HfO2/SiO2 multilayer mirror and polarizer coatings</title>

1997

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“…[10][11] The laser conditioning process consists of exposing an optical coating to a low laser fluence and then gradually increasing the fluence to the specified operating fluence of the coating. One method of laser conditioning is on-line conditioning.…”

Section: Laser Conditioning -Growth Detectionmentioning

confidence: 99%

Engineering meter-scale laser resistant coatings for the near IR

et al. 2005

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Laser resistant coatings are needed for beam steering (mirrors), pulse switching (polarizers), and high transport efficiency on environmental barriers (windows / lenses) on large laser systems. A range of defects limit the exposure fluence of these coatings. By understanding the origin and damage mechanisms for these defects, the deposition process can be optimized to realize coatings with greater laser resistance. Electric field modeling can provide insight into which defects are most problematic. Laser damage growth studies are useful for determining a functional laser damage criteria. Mitigation techniques such as micro-machining with a single-crystal diamond cutting tool or short pulse laser ablation using the burst technique can be used to arrest growth in damage sites to extend optic lifetime.

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“…Laser conditioning was originally developed to improve the damage resistance of multi-layer dielectric coatings [22,23,53] and KDP crystals [54,55]. For optical glasses, it is believed that laser conditioning gently removes surface or near-surface defects giving negligible damage that does not grow at high fluences [56].…”

Section: Laser-induced Damage To Optical Glass Surfacesmentioning

confidence: 99%

<title>The National Ignition Facility: the world's largest optics and laser system</title>

Moses

Campbell

Stolz

et al. 2003

Optical Engineering at the Lawrence Livermore National Laboratory

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The National Ignition Facility, a center for the study of high energy density plasma physics and fusion energy ignition, is currently under construction at the Lawrence Livermore National Laboratory. The heart of the NIF is a frequency tripled, flashlamp-pumped Nd:glass laser system comprised of 192 independent laser beams. The laser system is capable of generating output energies of 1.8MJ at 351nm and at peak powers of 500 TW in a flexible temporal pulse format. A description of the NIF laser system and its major components is presented. We also discuss the manufacture of nearly 7500 precision large optics required by the NIF including data on the manufactured optical quality vs. specification. In addition, we present results from an on-going program to improve the operational lifetime of optics exposed to high fluence in the 351-nm section of the laser.

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Large Area Laser Conditioning of Dielectric Thin Film Mirrors

Cited by 25 publications

References 22 publications

<title>Growth of laser-induced damage during repetitive illumination of HfO2/SiO2 multilayer mirror and polarizer coatings</title>

<title>Growth of laser-induced damage during repetitive illumination of HfO2/SiO2 multilayer mirror and polarizer coatings</title>

Engineering meter-scale laser resistant coatings for the near IR

<title>The National Ignition Facility: the world's largest optics and laser system</title>

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