STP1028

    Development of Composite Polymer-Glass Edge Claddings for Nova Laser Disks

    Published: Jan 1988


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    Abstract

    Large Nd:glass laser disks for disk amplifiers require an edge cladding which absorbs at 1 μm. This cladding prevents edge reflections from causing parasitic oscillations that would otherwise deplete the gain. We have developed a composite polymer-glass edge cladding that consists of absorbing glass strips bonded to the edges of laser glass disks using an epoxy adhesive. The edge cladding must survive a fluence of approximately 20 J/cm2 in a 0.5-ms pulse. Failure can occur either by decomposition of the polymer or by mechanical failure from thermal stresses which leads to bond delamination. An epoxy has been developed that gives the required damage resistance, refractive index match and processing characteristics, A slight tilt of the disk edges greatly reduces the threat from parasitic oscillations and a glass surface treatment is used to promote bond adhesion. Laser disks fabricated with this new cladding show identical gain performance to disks using conventional fused-glass cladding and have been tested for over 2000 shots (equivalent to about a 4-year lifetime on Nova) without degradation.

    Keywords:

    epoxy-glass bonding, laser glass edge cladding, Nova laser, optical epoxy, polymer damage


    Author Information:

    Campbell, JH
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Edwards, G
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Frick, FA
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Gemmell, DS
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Gim, BM
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Jancaitis, KS
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Jessop, ES
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Kong, MK
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Lyon, RE
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Murray, JE
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Patton, HG
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Pitts, JH
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Powell, HT
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Riley, MO
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Wallerstein, EP
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Wolfe, CR
    Lawrence Livermore National Laboratory University of California, Livermore, California

    Woods, BW
    Lawrence Livermore National Laboratory University of California, Livermore, California


    Paper ID: STP18533S

    Committee/Subcommittee: F01.07

    DOI: 10.1520/STP18533S


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