Dr. Fabian Röser Profile

Dr. Fabian Röser

R&D fiber lasers at Toptica Photonics AG

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Author

Publications (22)

Proceedings Article | 12 March 2024 Presentation + Paper

Femtosecond fiber delivery at 920 nm for two-photon microscopy

Konrad Birkmeier, Yik Long Li, Fabian Röser, Robert Herda, Laura Lohr, Luisa Hofmann, Bernhard Wolfring, Reto Häring, Florian Tauser

Proceedings Volume 12847, 1284703 (2024) https://doi.org/10.1117/12.3002446

KEYWORDS: Microscopes, Femtosecond phenomena, Two photon excitation microscopy, Fiber lasers, Femtosecond pulse shaping, Miniaturization, Lasers

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Proceedings Article | 21 June 2017 Presentation

Scaling EUV and X-ray Thomson sources to optical free-electron laser operation with traveling-wave Thomson scattering (Conference Presentation)

Klaus Steiniger, Daniel Albach, Alexander Debus, Markus Loeser, Richard Pausch, Fabian Roeser, Ulrich Schramm, Matthias Siebold, Michael Bussmann

Proceedings Volume 10234, 1023409 (2017) https://doi.org/10.1117/12.2265690

KEYWORDS: X-ray sources, Pulsed laser operation, Free electron lasers, Extreme ultraviolet, X-rays, Thomson scattering, Laser scattering, Laser optics, EUV optics, X-ray optics

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Traveling-Wave Thomson-Scattering (TWTS) allows for the realization of optical free-electron lasers (OFELs) from the interaction of short, high-power laser pulses with brilliant relativistic electron bunches. The laser field provides the optical undulator which is traversed by the electrons. In order to achieve coherent amplification of radiation through electron microbunching the interaction between electrons and laser must be maintained over hundreds to thousands of undulator periods. Traveling-Wave Thomson-Scattering is the only scattering geometry so far allowing for the realization of optical undulators of this length which is at the same time scalable from extreme ultraviolet to X-ray photon energies. TWTS is also applicable for the realization of incoherent high peak brightness hard X-ray to gamma-ray sources which can provide orders of magnitude higher photon output than classic head-on Thomson sources. In contrast to head-on Thomson sources TWTS employs a side-scattering geometry where laser and electron propagation direction of motion enclose an angle. Tilting the laser pulse front with respect to the wave front by half of this interaction angle optimizes electron and laser pulse overlap. In the side-scattering geometry the tilt of the pulse-front compensates the spatial offset between electrons and laser pulse-front which would be present otherwise for an electron bunch far from the interaction point where it overlaps with the laser pulse center. Thus the laser pulse-front tilt ensures continuous overlap between laser pulse and electrons while these traverse the laser pulse cross-sectional area. This allows to control the interaction distance in TWTS by the laser pulse width rather than laser pulse duration as is the case for head-on Thomson scattering. Utilizing petawatt class laser pulses with millimeter to centimeter scale width allows for the realization of compact optical undulators with thousands of periods. When laser pulses for TWTS are prepared, care has to be taken of laser dispersion. Especially for scenarios featuring interaction angles of several ten to over one hundred degree the angular dispersion originating from laser pulse-front tilt can significantly prolong the pulse duration during the interaction which leads to a decrease in optical undulator amplitude and eventually terminates the interaction long before the target interaction distance is reached. In the talk it is shown how a pair of two gratings can be used to first generate the pulse-front tilt and second control and compensate dispersion during the interaction by utilizing the plane of optimum compression. Furthermore an experimental setup strategy is presented allowing for an interaction outside the laser pulse focus. This is a necessity for TWTS OFELs requiring focusing to reach optical undulator strengths on the order of unity since the centimeter scale laser pulse width at the interaction point result in turn in Rayleigh lengths on the order of one hundred meter and thus in laser focusing distances of several hundred meter. The talk shows how an out-of-focus interaction geometry utilizing strong focusing of the incident laser pulse needs to be designed in order to regain compactness by reducing the focusing distance by one to two orders of magnitude.

Proceedings Article | 7 May 2013 Paper

PEnELOPE: a high peak-power diode-pumped laser system for laser-plasma experiments

Mathias Siebold, Fabian Roeser, Markus Loeser, Daniel Albach, Ulrich Schramm

Proceedings Volume 8780, 878005 (2013) https://doi.org/10.1117/12.2017522

KEYWORDS: Optical amplifiers, Semiconductor lasers, Near field, Laser systems engineering, Mirrors, Pulsed laser operation, Near field optics, Diodes, Laser applications, Crystals

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Proceedings Article | 17 February 2010 Paper

Spectral-temporal management of Yb-doped fiber CPA-systems

Damian Schimpf, Fabian Röser, Tino Eidam, Jens Limpert, Andreas Tünnermann

Proceedings Volume 7580, 75800Z (2010) https://doi.org/10.1117/12.842112

KEYWORDS: Amplifiers, Fiber amplifiers, Scanning probe microscopy, Ultrafast phenomena, Applied physics, Optical amplifiers, Systems modeling, Photonic crystal fibers, Modulation, Wave propagation

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Proceedings Article | 25 February 2009 Paper

Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system

A. Ancona, C. Jauregui, S. Döring, F. Röser, J. Limpert, S. Nolte, A. Tünnermann

Proceedings Volume 7203, 720311 (2009) https://doi.org/10.1117/12.813488

KEYWORDS: Picosecond phenomena, Laser ablation, Particles, Laser drilling, Metals, Pulsed laser operation, Copper, Ultrafast phenomena, Femtosecond phenomena, Thermal effects

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Proceedings Article | 19 February 2009 Paper

2 GW peak-power 29 fs pulses delivered by 30 kHz fiber chirped pulse amplifier pumped optical parametric amplifier

J. Rothhardt, S. Hädrich, F. Röser, T. Gottschall, J. Limpert, A. Tünnermann

Proceedings Volume 7195, 719513 (2009) https://doi.org/10.1117/12.808761

KEYWORDS: Optical amplifiers, Fiber amplifiers, Mirrors, Oscillators, Crystals, Pulsed laser operation, Ultrafast phenomena, Beam splitters, Optical testing, Quality measurement

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Proceedings Article | 19 February 2009 Paper

Femtosecond fiber CPA system with 325W average power

T. Eidam, F. Röser, E. Seise, T. Gottschall, S. Hädrich, J. Rothhardt, T. Schreiber, J. Limpert, A. Tünnermann

Proceedings Volume 7195, 719514 (2009) https://doi.org/10.1117/12.811903

KEYWORDS: Laser systems engineering, Fiber amplifiers, Femtosecond phenomena, Oscillators, Optical amplifiers, Dielectrics, Medium wave, Ultrafast phenomena, Solid state lasers, Laser applications

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Proceedings Article | 25 February 2008 Paper

Sub 30 fs pulses from 2 MHz repetition rate fiber amplifier pumped optical parametric amplifier

J. Rothhardt, S. Hädrich, F. Röser, B. Ortac, J. Limpert, A. Tünnermann

Proceedings Volume 6873, 68731L (2008) https://doi.org/10.1117/12.768520

KEYWORDS: Fiber amplifiers, Optical amplifiers, Solitons, Oscillators, Photonic crystal fibers, Nonlinear crystals, Diffraction gratings, Crystals, Silica, Phase modulation

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Proceedings Article | 25 February 2008 Paper

Spectral combining of pulsed fiber lasers: scaling considerations

O. Schmidt, S. Klingebiel, B. Ortac, F. Röser, F. Brückner, T. Clausnitzer, E.-B. Kley, J. Limpert, A. Tünnermann

Proceedings Volume 6873, 687317 (2008) https://doi.org/10.1117/12.763580

KEYWORDS: Fiber amplifiers, Pulsed fiber lasers, Fiber lasers, Diffraction gratings, Diffraction, Laser systems engineering, Semiconductor lasers, Optical amplifiers, Dielectrics, Modulation

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Proceedings Article | 13 March 2007 Paper

High power, ultra-short pulses from fiber laser pumped optical parametric amplifier

C. Aguergaray, T. Andersen, F. Röser, K. Rademaker, J. Limpert, E. Cormier, A. Tünnermann

Proceedings Volume 6460, 64600N (2007) https://doi.org/10.1117/12.713594

KEYWORDS: Optical amplifiers, Fiber amplifiers, Fiber lasers, Sapphire, Prisms, Laser optics, High power fiber amplifiers, Ultrafast phenomena, Crystals, Laser systems engineering

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Proceedings Article | 22 February 2007 Paper

Fiber laser pumped ultra-fast parametric amplifiers

J. Limpert, D. Schimpf, J. Rothhardt, S. Hädrich, O. Schmidt, F. Röser, T. Schreiber, A. Tünnermann, C. Aguergaray, E. Cormier, T. Andersen, C. Pedersen

Proceedings Volume 6453, 64530M (2007) https://doi.org/10.1117/12.717535

KEYWORDS: Fiber amplifiers, Fiber lasers, Crystals, Ultrafast phenomena, Photonic crystal fibers, Optical amplifiers, Solitons, Oscillators, Bragg cells, Photonic crystals

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Proceedings Article | 20 February 2007 Paper

90-W average-power, high-energy femtosecond fiber laser system

F. Röser, D. Schimpf, O. Schmidt, B. Ortac, K. Rademaker, J. Limpert, A. Tünnermann

Proceedings Volume 6453, 645310 (2007) https://doi.org/10.1117/12.701043

KEYWORDS: Laser systems engineering, Fiber amplifiers, Optical amplifiers, Photonic crystal fibers, Diffraction gratings, Femtosecond fiber lasers, Femtosecond phenomena, Fiber lasers, Dielectrics, Solid state lasers

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Proceedings Article | 23 February 2006 Paper

Spectral combining of fiber lasers

F. Röser, S. Klingebiel, A. Liem, T. Schreiber, S. Höfer, J. Limpert, T. Peschel, R. Eberhardt, A. Tünnermann

Proceedings Volume 6102, 61020T (2006) https://doi.org/10.1117/12.660725

KEYWORDS: Fiber lasers, Diffraction gratings, Absorption, Beam splitters, Silica, Reflection, Capacitance, Fiber amplifiers, Laser applications, Diffraction

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Proceedings Article | 23 February 2006 Paper

50 W, 50 fs pulses from a fiber laser system using nonlinear fiber compression

F. Röser, J. Rothhardt, T. Schreiber, J. Limpert, A. Tünnermann

Proceedings Volume 6102, 610210 (2006) https://doi.org/10.1117/12.646300

KEYWORDS: Dispersion, Mirrors, Fiber lasers, Complex systems, Laser systems engineering, Photonic crystal fibers, Fiber amplifiers, Medium wave, Scanning probe microscopy, Laser damage threshold

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Proceedings Article | 23 February 2006 Paper

Intense ultra-short fiber laser systems and their applications

J. Limpert, T. Schreiber, F. Röser, A. Tünnermann

Proceedings Volume 6102, 610213 (2006) https://doi.org/10.1117/12.659317

KEYWORDS: Fiber amplifiers, Fiber lasers, Optical amplifiers, Laser systems engineering, Oscillators, Femtosecond phenomena, Diffraction gratings, Ultrafast phenomena, Photonic crystal fibers, Picosecond phenomena

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Proceedings Article | 23 February 2006 Paper

Design and high power operation of a stress-induced single-polarization single-transverse mode LMA Yb-doped photonic crystal fiber

T. Schreiber, H. Schultz, F. Röser, O. Schmidt, J. Limpert, R. Iliew, A. Petersson, C. Jacobsen, K. Hansen, J. Broeng, A. Tünnermann

Proceedings Volume 6102, 61020C (2006) https://doi.org/10.1117/12.646020

KEYWORDS: Birefringence, Polarization, Optical fibers, Cladding, Photonic crystal fibers, Fiber lasers, Silica, Polarizers, Optical amplifiers, High power lasers

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Proceedings Article | 10 February 2006 Paper

Ultrafast parametric amplifier pumped by a fiber laser system

C. Aguergaray, T. Andersen, O. Schmidt, F. Röser, C. Bruchmann, J. Limpert, E. Cormier, A. Tünnermann

Proceedings Volume 6103, 61030H (2006) https://doi.org/10.1117/12.646118

KEYWORDS: Fiber amplifiers, Optical amplifiers, Fiber lasers, Picosecond phenomena, Crystals, Femtosecond phenomena, Ultrafast phenomena, Photonic crystal fibers, Laser systems engineering, Bragg cells

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Proceedings Article | 22 April 2005 Paper

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

A. Tuennermann, S. Hoefer, A. Liem, J. Limpert, M. Reich, F. Roeser, T. Schreiber, H. Zellmer

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.594514

KEYWORDS: Optical fibers, Fiber lasers, Photonic crystal fibers, Cladding, Amplifiers, Fiber amplifiers, Diffraction, Silica, Continuous wave operation, Single mode fibers

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Proceedings Article | 22 April 2005 Paper

High average power femtosecond parabolic pulse fiber amplifier

T. Schreiber, F. Roeser, A. Liem, J. Limpert, H. Zellmer, A. Tuennermann

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.589807

KEYWORDS: Femtosecond phenomena, Amplifiers, Fiber amplifiers, Diffraction gratings, Polarization, Diffraction, Oscillators, Semiconductor lasers, High power fiber amplifiers, Optical amplifiers

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Proceedings Article | 22 April 2005 Paper

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

T. Schreiber, A. Liem, F. Roeser, H. Zellmer, A. Tuennermann, J. Limpert, N. Deguil-Robin, I. Manek-Honninger, F. Salin, A. Courjaud, C. Honninger, E. Mottay

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.590469

KEYWORDS: Picosecond phenomena, Fiber amplifiers, Amplifiers, Scanning probe microscopy, Photonic crystal fibers, Oscillators, Polarization, Fiber lasers, Nonlinear optics, Laser applications

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Proceedings Article | 21 March 2005 Paper

Highly efficient dielectric gratings for high-power ultrafast femtosecond fiber laser systems

T. Clausnitzer, Thomas Schreiber, Fabian Roeser, Jens Limpert, H.-J. Fuchs, Ernst-Bernhard Kley, Andreas Tunnermann

Proceedings Volume 5714, (2005) https://doi.org/10.1117/12.590461

KEYWORDS: Diffraction gratings, Diffraction, Cladding, Dielectrics, Fiber amplifiers, Silica, Femtosecond phenomena, Photonic crystal fibers, Fiber lasers, Laser systems engineering

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Micromachining applications require high pulse energy (>1μJ) short pulse (<1ps) laser systems at high repetition rates. Rare-earth doped fibers are attractive to generate these target values by the amplification of ultrafast femtosecond seed sources. Two favored techniques have been used: the chirped pulse amplification (CPA) scheme where the pulses are stretched in the time domain to reduce nonlinearity in the amplifier stage and the parabolic pulse amplification scheme where the combined effect of nonlinearity, normal dispersion and gain in the fiber generate linearly chirped parabolic shaped pulses. Both approaches can be scaled to higher power by reducing the nonlinearity in the amplifiers. To achieve this, we discuss novel photonic crystal fiber designs which allow for larger single-mode core diameter and reduced absorption length and therefore reduced nonlinearity. The so generated high average power of >100 W at repetition rate up to several tens of MHz cannot be compressed by gold gratings to femtosecond pulse duration due to thermal heating. We focus on the development of dielectric gratings in fused silica which can handle this power levels due to their high damage threshold. Two kinds of gratings are discussed. Firstly, the transmission gratings with a period of 800 nm were designed to possess 96% diffraction efficiency over a spectral range from 1.03μm to 1.09μm. The fabrication of the rectangular groove profile was done using electron beam lithography and reactive ion beam etching into the fused silica substrate. The measured diffraction efficiency was 96.5% @ 1060nm. Secondly, dielectric reflection gratings, which consist of a dielectric grating on top of a high-reflective layerstack, can theoretically exhibit a diffraction efficiency of even higher than 99%. To achieve this we chose a period of 1060nm. The fabrication was done similar to the transmission gratings, though a HR-coated substrate had to be used instead of the simple fused substrate. The fabricated gratings show a diffraction efficiency of 99.6%. Both are applied to the discussed high power fiber amplifier stages to generate linearly polarized femtosecond pulses at ~100 W average power with a repetition rate of 80 MHz.

Proceedings Article | 23 December 2004 Paper

High-power fiber lasers and amplifiers

Andreas Tuennermann, Sven Hoefer, Andreas Liem, Jens Limpert, Matthias Reich, Fabian Roeser, Thomas Schreiber, Holger Zellmer

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.580850

KEYWORDS: Optical fibers, Fiber lasers, Cladding, Photonic crystal fibers, Fiber amplifiers, Silica, Single mode fibers, Refractive index, Continuous wave operation, Diffraction

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Showing 5 of 22 publications

Conference Committee Involvement (1)

Fiber Lasers IV: Technology, Systems, and Applications

22 January 2007 | San Jose, California, United States

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