High-energy, diode-pumped, nanosecond Yb : YAG MOPA system

Max-Planck-Institute for Quantum Optics (MPQ), Hans-Kopfermann-Str. 1, 85748 Garching, Germany.
Optics Express (Impact Factor: 3.53). 04/2008; 16(6):3674-9. DOI: 10.1364/OE.16.003674
Source: PubMed

ABSTRACT Diode-pumped nanosecond multi-pass laser amplification to the joule level using an Yb:YAG slab crystal has been demonstrated. A maximum output pulse energy of 2.9 J at an optical-to-optical efficiency of 10% has been achieved. The seed pulses with a pulse duration of 6.4 ns were generated in a Q-switched Yb:YAG laser and amplified up to a pulse energy of 200mJ in a multi-pass booster amplifier. A maximum average output power of 15W at a repetition rate of 10 Hz has been measured. We also present a relay imaging semi-stable cavity for multi-pass amplification and a diode-pumping scheme employing horizontally stacked high-power laser diodes.

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    ABSTRACT: In this paper the development and implementation of a novel amplifier setup as an additional stage for the CPA pump laser of the Petawatt Field Synthesizer, currently developed at the Max-Planck-Institute of Quantum Optics, is presented. This amplifier design comprises 20 relay-imaged passes through the active medium which are arranged in rotational symmetry. As the gain material, an in-house-developed Yb:YAG active-mirror is used. With this setup, stretched 4 ns seed pulses are amplified to output energies exceeding 1 J with repetition rates of up to 2 Hz. Furthermore, a spectral bandwidth of 3.5 nm (FWHM) is maintained during amplification and the compression of the pulses down to their Fourier-limit of 740 fs is achieved. To the best of our knowledge, this is the first demonstration of 1 TW pulses generated via CPA in diode-pumped Yb:YAG.
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    ABSTRACT: The energy storage in the Cr4+,Yb:YAG crystal amplifier was stimulated under the conditions of concentration thickness product 15at.%mm and pumping power density 20kW/cm2 for different aperture and doped Cr4+ and Yb3+density, using the pumping dynamic model for Cr4+,Yb:YAG crystal amplifier. The results indicated that, the density of energy storage decreases with the increasing of Yb3+ and amplifier aperture in absence of Cr4+; but the co-doped Cr4+ in Yb:YAG crystal would suppress the ASE in amplifier and affect on the energy storage in the amplifier, the ASE decreases with the increasing of co-doped Cr4+. But the maximum energy storage in amplifier increases firstly, and then decreases with the increasing of Cr4+ density. The reason is that, the Cr4+ in amplifier absorb not only the ASE but also the pumping energy. When less co-doped Cr4+, the ASE in amplifier would be serious, but when more co-doped Cr4+, the co-doped Cr4+ would absorb more pumping energy. Namely, in order to obtain maximum energy storage there is an optimized Cr4+ density, which was determined by the Yb3+ density and aperture of amplifier.
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