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Striated composite layers of silica and hafnia offering advantageous properties for short-pulse optical coatings

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/oe.507821· OSTI ID:2293654
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. University of Rochester, NY (United States); Vacuum Innovations, Dansville, NY (United States); Laboratory for Laser Energetics, University of Rochester
  2. University of Rochester, NY (United States)
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Monolayers containing subnanometer striations of silica and hafnia to form composite materials at varying ratios are explored as a method to develop high-index dielectric layers with increased laser-induced–damage thresholds (LIDTs). These layers can then be used in multilayer dielectric coatings for short-pulse, high-peak-power laser applications, particularly in regions of the highest electric-field intensity. Fabrication is achieved by means of exposure to two different evaporant vapor plumes, where local exposure to each plume is controlled via shielding to prevent simultaneous exposure. The LIDT of the resulting layers has been evaluated at 1053 nm with 600-fs pulses. The results indicate that such hafnia/silica layers exhibit LIDTs similar to silica for a refractive index of ≤1.65. These results suggest that the use of these layers in locations subjected to high electric-field intensity within multilayer dielectric coatings may significantly improve the LIDT, with this deposition process providing particular benefit for scaling to large-aperture, high-fluence components.
Research Organization:
University of Rochester, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003856
OSTI ID:
2293654
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 4 Vol. 32; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)

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36 MATERIALS SCIENCE