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Title: Large optics for the National Ignition Facility

The National Ignition Facility (NIF) laser with its 192 independent laser beams is not only the world’s largest laser, it is also the largest optical system ever built. With its 192 independent laser beams, the NIF requires a total of 7648 large-aperture (meter-sized) optics. One of the many challenges in designing and building NIF has been to carry out the research and development on optical materials, optics design, and optics manufacturing and metrology technologies needed to achieve NIF’s high output energies and precision beam quality. This paper describes the multiyear, multi-supplier, development effort that was undertaken to develop the advanced optical materials, coatings, fabrication technologies, and associated process improvements necessary to manufacture the wide range of NIF optics. The optics include neodymium-doped phosphate glass laser amplifiers; fused silica lenses, windows, and phase plates; mirrors and polarizers with multi-layer, high-reflectivity dielectric coatings deposited on BK7 substrates; and potassium di-hydrogen phosphate crystal optics for fast optical switches, frequency conversion, and polarization rotation. Also included is a discussion of optical specifications and custom metrology and quality-assurance tools designed, built, and fielded at supplier sites to verify compliance with the stringent NIF specifications. In addition, a brief description of the ongoing program to improvemore » the operational lifetime (i.e., damage resistance) of optics exposed to high fluence in the 351-nm (3ω) is provided.« less
Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
OSTI Identifier:
1241948
Report Number(s):
LLNL--TR-666625
TRN: US1600907
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIELECTRIC MATERIALS; DOPED MATERIALS; US NATIONAL IGNITION FACILITY; HYDROGEN PHOSPHATES; LASERS; NEODYMIUM; DOPED MATERIALS; POTASSIUM COMPOUNDS; AMPLIFIERS; DESIGN; SILICA; SWITCHES; PHOSPHATE GLASS; COATINGS; ROTATION; SPECIFICATIONS; TOOLS; OPTICAL SYSTEMS; QUALITY ASSURANCE; ACCURACY; COMPLIANCE; FREQUENCY CONVERTERS; CRYSTALS; FABRICATION; LAYERS; LENSES; SERVICE LIFE; MANUFACTURING; MIRRORS; PLATES; POLARIZATION; RADIATION HARDENING; MEASURING METHODS National Ignition Facility; optics fabrication for high fluence lasers; large-aperture optical metrology tools