Functional damage thresholds of hafnia/silica coating designs for the NIF laser

Taniguchi, Jason; LeBarron, Nelson E.; Howe, James D.; Smith, Douglas J.; Stolz, Christopher J.; Weinzapfel, Carolyn L.; Kimmons, James F.

doi:10.1117/12.425071

Cited by 14 publications

(8 citation statements)

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“…It reveals that the growth probability strongly depends on the initial damage site, and that its evolution as a function of growth fluences fits a sigmoid trend. Few experiments have been conducted on high-reflective (HR) dielectric coatings in the nanosecond regime [14], and have shown a linear growth of damage diameters. More recently, damage growth sequences on a HR coating at 30-ps have been observed [15].…”

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confidence: 99%

Laser damage growth with picosecond pulses

et al. 2016

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mentioning

confidence: 99%

Laser damage growth with picosecond pulses

et al. 2016

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“…The new testing protocol allows up to 10 damage sites providing they are stable (do not grow) upon subsequent exposure to laser fluences up to the specification fluence. The approach of allowing stable damage sites is consistent with the concepts of a functional damage threshold 4 and conditioning large optic (>40 cm) mirrors for NIF A would result in the coating run failing a damage specification of 13 J/cm 2 since 2 damage sites occurred, yet the test at location B would result in the coating passing the same 13 J/cm 2 specification.…”

Section: Introductionmentioning

confidence: 70%

Improved method for laser damage testing coated optics

et al. 2005

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The damage test procedure for qualifying a coating run of anti-reflection coated optics consists of scanning a pulsed 1064 nm laser over a 1 cm x 1 cm area on a test sample to illuminate approximately 2400 sites. Scans are repeated at 3 J/cm 2 increments until the fluence specification for the optic is reached. In the past, initiation of 1 or more damage sites was classified as a failed coating run, requiring the production optics in the corresponding coating lot be reworked and recoated. Recent laser damage growth tests of 300 repetitive pulses performed on numerous damage sites revealed that all were stable up to 20 J/cm 2 . Therefore the acceptance criteria has been modified to allow a moderate number of damage sites, as long as they are smaller than the allowed dig size and are stable (do not grow). Consequently many coating runs that previously would have been rejected are now accepted, resulting in higher yield, lower cost, and improved delivery schedule. The new test also provides assurance that initiated damage sites are stable during long term operation.

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“…Moreover, after the appearance of the laser damage events, the stabilization and growth characterization of initial damage sites under additional laser shots is essential to the practical application of optics. Therefore, we pay more attention to the raster scan protocol and investigate the functional damage threshold [7] .…”

Section: Introductionmentioning

confidence: 99%

Automated laser damage threshold test systems of different test modes for optical elements

Zhang

et al. 2012

SPIE Proceedings

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The automated laser damage threshold test systems of different test modes are developed recently with micron-scale damage events automated detection, location and re-inspection. The system is carried out using a 10 ns pulsed Nd:YAG laser with a repetition rate of 10 Hz. In view of the requirements of weak site identification and growth test for initial damage sites, we pay more attention to the raster scan protocol. The automated test system is enabled by the pulsed stage movement method. A one pulse to one image correspondence have been set up during scans, which is available for the later confirmation of the automated damage detection results and the growth study at specified test sites. The new and grown defects are decided by comparing the pre-image and current image at the same place during different scans. Currently, the defect comparison rules and tolerance are being optimized to improve the accuracy of test systems.

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Functional damage thresholds of hafnia/silica coating designs for the NIF laser

Cited by 14 publications

References 0 publications

Laser damage growth with picosecond pulses

Laser damage growth with picosecond pulses

Improved method for laser damage testing coated optics

Automated laser damage threshold test systems of different test modes for optical elements

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