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3 November 2005 Evaluation of different configurations of resonant pumped 2 μm-Ho:YAG lasers
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Efficient generation with good beam quality and high output power in the 3-5 μm wavelength range is desired and a 2 μm-pumped Optical Parametric Oscillator is a promising design for this purpose. The low quantum defect of a resonant laser pumping of the Ho 5I7 manifold using 1.9 μm radiation leads to an efficient 2.09 μm laser. Due to a long fluorescence lifetime and a good energy storage capability, the system is well-suited for either increased average power at high repetition rates (more than tens of kHz) or high energy output at low repetition rates (several tens of Hz). For both repetition rate ranges, we propose to evaluate critical components of the system such as the Tm pump laser source. Performances of a Ho:YAG laser pumped either by a 50 W Tm:fiber laser or by a 20 W Tm:YLF laser are compared. Efficiencies of the modulation devices are reported for an AOM and a RTP Q-switch cell.
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Christelle Kieleck, Antoine Hirth, and Martin Schellhorn "Evaluation of different configurations of resonant pumped 2 μm-Ho:YAG lasers", Proc. SPIE 5989, Technologies for Optical Countermeasures II; Femtosecond Phenomena II; and Passive Millimetre-Wave and Terahertz Imaging II, 598905 (3 November 2005);

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