STP1028: Radiation Hardness of Nd:YAG and Nd:Cr:GSGG Laser Rods

    Acharekar, MA
    Litton Systems, Inc., Apopka, FL

    Kaplan, MM
    Litton Systems, Inc., Apopka, FL

    McCarthy, DP
    Litton Systems, Inc., Apopka, FL

    Pages: 14    Published: Jan 1988


    Abstract

    Gadolinium scandium gallium garnett (GSGG) co-doped with neodymium (Nd) and chromium (Cr), shows higher efficiency and optical damage threshold than commonly used neodymium doped yttrium aluminum garnet (Nd:YAG) laser rod. Nd:YAG and Nd:Cr:GSGG laser rods were irradiated with gamma radiation from Cobalt-60 source. Passive electronic and vibrational spectra of the laser materials were obtained before and after radiation. The near ultraviolet (NUV), visible (VIS) and near infrared (NIR) spectra were obtained using a Varian Model 2300 spectrophotometer. The infrared (IR) spectra were obtained using a Perkin-Elmer Model 783 Infrared Spectrophotometer and Model 7500 Infrared Data System. The active laser tests were conducted to study the effects of irradiation on the efficiency of the laser materials.

    The data collected indicates that the Nd:YAG laser rod had transient radiation effects while the Nd:Cr:GSGG laser rod appeared to be resistant to the effects of the radiation dose in terms of the laser's output energy.

    Keywords:

    Electronic and Vibrational Spectra, Gamma Radiation Effects, Laser Crystals, Nd:Cr:GSGG, Nd:YAG, Radiation Durability


    Paper ID: STP18545S

    Committee/Subcommittee: F01.14

    DOI: 10.1520/STP18545S


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