A high power D2O laser optimized for microsecond pulse duration

  • R. Behn
    Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH-1007 Lausanne, Switzerland
  • I. Kjelberg
    Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH-1007 Lausanne, Switzerland
  • P. D. Morgan
    Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH-1007 Lausanne, Switzerland
  • T. Okada
    Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH-1007 Lausanne, Switzerland
  • M. R. Siegrist
    Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH-1007 Lausanne, Switzerland

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<jats:p>A high power D2O laser, pumped by a single mode CO2 laser, has been optimized to produce 1 μs pulses at 385 μm. Pump energies up to 100 J were available using an e-beam preionized CO2 amplifier at 2.5 atm. Far infrared pulse energies of 140 mJ in multimode and 40 mJ in single mode operation have been obtained from a 4-m unstable resonator. During parametric studies the influence of operating pressure, spatially inhomogeneous pump intensity, resonator feedback as well as saturation effects have been investigated.</jats:p>

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