STP954

    Application of a Computer-Automated IR Sensitive Camera To the Determination of Pulsed Laser Surface Damage Thresholds

    Published: Jan 1986


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    Abstract

    An inexpensive, easily constructed infrared-sensitive camera system which as an active electronic readout is described in detail and examples of its utility in the determination of surface damage thresholds are presented. A small fraction of the pulsed 1.06 μm laser beam incident on the sample is split off and directed to a screen. The beam spatial profile of each shot is then imaged onto a 100 × 100 photodiode array whose output is digitized and stored by a PDP 11/23 computer-controlled data acquisition system. Further processing of the image data by a VAX 11/780 computer yields a high resolution fluence contour map of the laser beam incident on the sample. This map is especially useful when irradiating areas of several cm2 during material testing experiments. The map, showing the variation of beam fluence over its cross-section, can be superposed over the damaged sample providing an accurate value for the surface damage threshold for the material or coating. Examples will be presented and additional advantages of large area irradiation discussed.

    Keywords:

    beam profiling, data acquisition, large area irradiation, pulsed laser damage, surface damage thresholds


    Author Information:

    Filbert, PC
    Lockheed Palo Alto Research Laboratory, Palo Alto, California

    Guttman, JL
    Lockheed Palo Alto Research Laboratory, Palo Alto, California

    Navoda, CL
    Lockheed Palo Alto Research Laboratory, Palo Alto, California

    Watson, BA
    Lockheed Palo Alto Research Laboratory, Palo Alto, California


    Paper ID: STP23109S

    Committee/Subcommittee: E13.03

    DOI: 10.1520/STP23109S


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