Cooling schemes for longitudinally diode laser-pumped Nd:YAG rods

R. Weber, B. Neuenschwander, M. MacDonald, M. B. Roos, H. P. Weber

    Research output: Contribution to journalArticlepeer-review

    140 Citations (Scopus)


    Longitudinal diode laser pumping causes pronounced inhomogenous heating of the laser material. The effect of the thermal load on the mechanical and optical properties is significantly influenced by the method used for cooling the pumped surface. Four methods for longitudinally pumped Nd:YAG rods were compared experimentally and with finite-element (FE) analysis. The pumped surface exposed to air or to flowing water, a sapphire plate pressed onto the pumped surface and composite rods, having an undoped pumped end, were investigated. The comparison includes temperature and stress distributions with the emphasis on thermal lensing. Careful validation of the FE code with experiments allowed to numerically comparing the cooling methods under identical conditions.

    Original languageEnglish
    Pages (from-to)1046-1053
    Number of pages8
    JournalIEEE Journal of Quantum Electronics
    Issue number6
    Publication statusPublished - Jun 1998


    • Cooling
    • Diode lasers
    • Heat pumps
    • Iron
    • Laser excitation
    • Optical materials
    • Optical pumping
    • Pump lasers
    • Thermal loading
    • Thermal stresses


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