STP759: Pulse-Width and Focal-Volume Dependence of Laser-Induced Breakdown

    Van Stryland, EW
    North Texas State University, Denton, Texas

    Soileau, MJ
    North Texas State University, Denton, Texas

    Smirl, AL
    North Texas State University, Denton, Texas

    Williams, WE
    North Texas State University, Denton, Texas

    Pages: 10    Published: Oct 1981


    Abstract

    The laser-induced breakdown fields at 1.06 μm of fused SiO2, single-crystal NaCl, and air were measured as a function of focal volume and laser pulse width while keeping all other parameters, including the specimen, constant. The laser pulse width was varied from 40 psec to 31 nsec, and the focal volume was varied by over two orders of magnitude. The dependence of the breakdown field for NaCl and SiO2 on the laser pulse width tp and the focal folume V was empirically determined to be EB = AV−1tp−1/4 + C and the dependence for air to be EB = (AV−1 + C) tp−1/4, where A and C are material-dependent constants. Current theories of laser-induced breakdown are carefully compared with these present measurements and are found to be inconsistent.

    Keywords:

    Air breakdown, laser damage, NaCl, picosecond phenomena, self-focusing, SiO, 2


    Paper ID: STP37029S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP37029S


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