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A multi-pass Yb:CaF2 disk amplifier pumped with a diode laser module was built having a peak power of 16.8 kW (provided by Lastronics GmbH, Germany). A maximum pump energy of 40.3 J at a wavelength of 940 nm was obtained at a pump duration of 2.4 ms while the flat-top shaped pump profile (6 χ 6 mm2) was homogenized by a doublet of micro-lens arrays inside the module and imaged into the gain medium. The seed pulses with a duration of 6 ns (FWHM) were generated in a Q-switched Yb YAG oscillator and then pre-amplified from 400 μj to 100 mJ at a repetition rate of 1 Hz in a booster Yb:YAG amplifier.
Date of Conference: 22-26 May 2011