F. Roeser

Helmholtz-Zentrum Dresden-Rossendorf

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U. Schramm

Helmholtz-Zentrum Dresden-Rossendorf

M. Siebold

Helmholtz-Zentrum Dresden-Rossendorf

Markus Loeser

Helmholtz-Zentrum Dresden-Rossendorf

Jens Limpert

Fraunhofer Institute for Applied Optics and Precision Engineering

Thomas Schreiber

Fraunhofer Institute for Applied Optics and Precision Engineering

A. Liem

Rheinmetall (Germany)

H. Zellmer

Leipzig University of Applied Sciences

Andreas Tuennermann

Fraunhofer Institute for Applied Optics and Precision Engineering

Joachim Hein

Helmholtz Institute Jena

D. Albach

Helmholtz-Zentrum Dresden-Rossendorf

Cooperative Institutions

Friedrich Schiller University Jena

Helmholtz Institute Jena

Helmholtz-Zentrum Dresden-Rossendorf

Schiller International University

Fraunhofer Institute for Applied Optics and Precision Engineering

GSI Helmholtz Centre for Heavy Ion Research

Max Planck Institute of Quantum Optics

TU Dresden

Centre National de la Recherche Scientifique

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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High energy CPA-free picosecond Yb:YAG amplifier

Lasers, Sources, and Related Photonic Devices (2012)

Markus Loeser M. Siebold F. Roeser U. Schramm

We report on a CPA free picosecond MOPA system consisting of a fs Yb:KGW oscillator and 2 subsequent amplifiers using Yb:YAG active mirrors. A maximum pulse energy of 35mJ at 10Hz repetition rate was achieved.

Picosecond

Repetition (rhetorical device)

Ytterbium

Regenerative amplification

10.1364/assp.2012.am4a.16

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Citations (4)

Large mode area fibers for high power laser operation based on solid- and air-microstructured cores (Invited Paper)

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Andreas Tuennermann Sven Hoefer A. Liem Jens Limpert M. Reich

In the last years a dramatic increase of the output power of rare-earth-doped fiber lasers and amplifiers with diffraction limited beam quality has been observed. These demonstrates impressively that fiber lasers and amplifiers are an attractive and power scalable solid-state laser concept. The main limiting factors for the laser output power are the damage of the fiber ends, heating of the fiber due to the quantum defect and nonlinear effects. To overcome these problems, an increasing of the core diameter and keeping the fiber single mode, by using solid core step-index large-mode-area fibers, allow the power scaling beyond 1 kW at diffraction limited beam quality. A further scaling is possible by using novel highly doped air-clad photonic crystal fibers with increased mode field diameters of the active core. This type of fibers has several new preferable features. In our contribution we will discuss the advantages of microstructured fibers to reduce nonlinear effects inside the fiber and the possibility to scale the output power of fiber lasers and amplifiers with excellent beam quality. We also show experiments with pulsed fiber amplifier systems using these microstructured large mode area fibers.

Mode field diameter

Plastic-clad silica fiber

Double-clad fiber

Mode volume

10.1117/12.594514

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Citations (9)

High-power fiber lasers and amplifiers

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Andreas Tuennermann Sven Hoefer A. Liem Jens Limpert M. Reich

Experimental results based on rare-earth-doped fibers have impressively shown that fiber lasers and amplifiers are an attractive and power scalable solid-state laser concept. Based on ytterbium-doped large-mode-area double-clad fibers, in the continuous regime, output powers approaching the kW-range with diffraction limited beam quality have been shown. Average output powers in the order of 100 W have been demonstrated in the pulsed regime even for femtosecond fiber lasers. Further power scaling is limited by the end facets damage, thermo-optical problems or nonlinear effects. To overcome these restrictions microstructured fibers with several new preferable features can be used. In our contribution we will discuss power scaling of fiber lasers and amplifiers in the multi kW-range with excellent beam quality based on rare-earth-doped photonic crystal fibers.

Double-clad fiber

Ytterbium

10.1117/12.580850

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Citations (1)

High-power picosecond pulses by SPM-induced spectral compression in a fiber amplifier

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Thomas Schreiber A. Liem F. Roeser H. Zellmer Andreas Tuennermann

The fiber based generation of nearly transform-limited 10-ps pulses with 200 kW peak power (97 W average power) based on SPM-induced spectral compression is reported. Efficient second harmonic generation applying this source is also discussed.

Picosecond

Pulse compression

Fiber amplifier

10.1117/12.590469

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Citations (1)

Pyrometer-Schutzrohre Messung der Gas-Durchlässigkeit

tm - Technisches Messen (1932)

F. Roeser

Pyrometer

10.1524/teme.1932.1324.jg.194

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Citations (0)

High-energy, diode-pumped Yb:CaF<inf>2</inf> disk-laser

M. Siebold Markus Loeser F. Roeser Florian Kroll Jörg Körner

A multi-pass Yb:CaF ₂ 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.

Disk laser

Booster (rocketry)

Optical Pumping

10.1109/cleoe.2011.5942465

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Citations (0)

94 W 980 nm high brightness Yb-doped fiber laser

Optics Express (2008)

F. Roeser César Jáuregui Jens Limpert Andreas Tünnermann

We report on the generation of 94 W continuous wave output power at 980 nm using an Yb-doped fiber laser. This is achieved using an ultra large-mode-area rod-type photonic crystal fiber pumped at 915 nm. To the best of our knowledge this is the highest output power close to diffraction-limited beam quality (M(2) about 2.2) achieved in this wavelength range from fibers so far .The experimental results are supported by detailed numerical simulations that provide a deeper understanding of the laser process, in particular the competition with the 1030 nm emission.

Continuous wave

10.1364/oe.16.017310

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Citations (153)

High-energy, ceramic-disk Yb:LuAG laser amplifier

Optics Express (2012)

M. Siebold Markus Loeser F. Roeser Michael Seltmann G. Harzendorf

We report the first short-pulse amplification results to several hundred millijoule energies in ceramic Yb:LuAG. We have demonstrated ns-pulse output from a diode-pumped Yb:LuAG amplifier at a maximum energy of 580 mJ and a peak optical-to-optical efficiency of 28% at 550 mJ. In cavity dumped operation of a nanosecond oscillator we obtained 1 mJ at up to 100 Hz repetition rate. A gain bandwidth of 5.4 nm was achieved at room temperature by measuring the small-signal single-pass gain. Furthermore, we compared our results with Yb:YAG within the same amplifier system.

Nanosecond

Regenerative amplification

10.1364/oe.20.021992

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Citations (19)

OPTICAL SYNCHRONIZATION AND ELECTRON BUNCH DIAGNOSTIC

Michael Kuntzsch U. Lehnert F. Roeser R. Schurig Michael Bousonville

The commissioning of the extended linear electron accelerator ELBE at Helmholtz-Zentrum DresdenRossendorf started in autumn 2012. The new beamlines will deliver short electron pulses with 150 fs duration and bunch charge up to 1 nC. This will drive two THzsources, one broadband CTR/CDR and a narrowband undulator source. To enable highly resolved pump-probe experiments with table top laser sources pump and probe beams have to be synchronized on a 100 fs time scale. This paper describes how the synchronization at ELBE is done for the upcoming experiments and focus on first measurement results of the ELBE bunch arrival time monitor (BAM) based on that system.

Undulator

Narrowband

Source

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High-energy laser amplifiers using ultra-broad emitting Yb-doped materials

Lasers, Sources, and Related Photonic Devices (2012)

M. Siebold Markus Loeser F. Roeser R. Uecker J. Koerner

High-energy laser amplifiers using Yb-doped gain media often show reduced efficiencies especially when operating at ultra-short pulses. We summarize techniques to improve storage and extraction efficiencies of Yb-based laser amplifiers.

Ytterbium

10.1364/aiom.2012.iw5d.1

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Citations (0)