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OMNI Interlocken Hotel
Broomfield (Boulder area), Colorado, United States
22 - 25 September 2019
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Thin Film Damage Competition

1064-nm Mirror Thin Film Damage Competition
Coordinated by: Raluca A. Negres, Christopher J. Stolz, Lawrence Livermore National Lab. (USA)

A double-blind laser damage competition will be held to determine the progress in nanosecond laser damage resistance of 1064-nm, 0 degree multilayer mirrors over the last decade since the 2008 initial launch of this thin film damage competition with mirrors of the same specifications. The results will be shared at SPIE Laser Damage 2019. The mirrors must meet the following requirements:

  • Reflectance >99.5%
  • Wavelength 1064 nm
  • 0 degrees incidence angle
  • Pulse length 5-ns; Single-longitudinal mode laser; Repetition rate 10 Hz
  • Environment: Ambient air (normal and low humidity possible)
  • No wavefront or stress requirement
  • No surface quality requirement.

The coatings shall be deposited on glass substrates provided by the coating supplier; it is highly desired to have a polished rear surface. The dimensions of the substrate shall be 50 mm (+/- 1 mm) in diameter and at least 10 mm thick.

This is a continuation of last year's laser damage competition aiming to assess the correlation in damage resistance of these 1064-nm HR coatings as inferred from two different damage testing protocols, i.e. raster scanning (2018) vs. ISO testing (2019). Any new sample submittals must be preapproved by Raluca Negres at negres2@llnl.gov. Due to increased test complexity, we advise the participants to prepare samples as early as possible as we will try to minimize the number of damage tests (old and new sample submissions).

Samples must be received by 1 June 2019 to the following address:

Raluca Negres, L-470
Lawrence Livermore National Laboratory
7000 East Avenue
Livermore, CA 94550

Each sample will be assigned a unique label to maintain anonymity. The origin of the samples will not be released to the damage testing service and also will not be published at the Laser Damage Symposium or within the proceedings. A summary of the results will be published in the conference proceedings. Coating suppliers will be informed of the measured results and relative ranking within the submitted population. In addition to the sample, the coating supplier MUST also supply the following information:

      • Coating materials and number of layers
      • Reflectance or transmission spectral scan (prefer in an electronic format) from ~900-1200nm.
      • Spectral scans may be emailed to negres2@llnl.gov
      • A brief description of the deposition method (e-beam, IAD, IBS, plasma assist, etc.)
      • Substrate material and cleaning method.

Failure to provide the required information will result in sample disqualification. If two samples are submitted, the vendor must describe the manufacturing differences between the two samples. Optical or scanning electron microscopy may be used to image damage sites. Reflectance measurements may also occur. No other characterization tools will be used on the samples to protect any proprietary features of the samples.

Testing will be performed by

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Important Dates

Post-deadline Abstracts
Submission Instructions

Manuscript Due Date
23 October 2019

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