Dr. Andreas Liem Profile

Dr. Andreas Liem

at Fraunhofer-IOF

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 13 May 2024 Presentation

Presentation

Spectral beam combining for security as well as terrestrial, satellite, and deep space communication

T. Walbaum, M. Plötner, M. Strecker, M. Heinzig, A. Liem, S. Ehrhardt, F. Möller, C. Damm, S. Trautmann, C. Rothhardt, T. Peschel, M. Jung, K. Ludewigt, T. Schreiber

Proceedings Volume PC12865, PC128650E (2024) https://doi.org/10.1117/12.3001748

KEYWORDS: Telecommunications, Satellite communications, Satellites, Wavelength division multiplexing, Standards development, Optical design, Miniaturization, Laser systems engineering, Dichroic mirrors

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Proceedings Article | 7 October 2019 Paper

Paper

High-power laser development for laser weapons

K. Ludewigt, A. Liem, U. Stuhr, M. Jung

Proceedings Volume 11162, 1116207 (2019) https://doi.org/10.1117/12.2538460

KEYWORDS: Fiber lasers, Laser applications, Diodes, Diffraction gratings, Weapons, Mirrors, High power lasers, Laser development, Ytterbium, Laser systems engineering

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Proceedings Article | 14 March 2018 Presentation

Presentation

TMI-threshold investigations of low NA Yb-doped single mode fibers (Conference Presentation)

Franz Beier, Friedrich Möller, Johannes Nold, Bettina Sattler, Stefan Kuhn, Christian Hupel, Sigrun Hein, Andreas Liem, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10512, 1051203 (2018) https://doi.org/10.1117/12.2287699

KEYWORDS: Fiber amplifiers, Absorption, Single mode fibers, Thermal effects, Fiber lasers, Solid state lasers, Ytterbium, Manufacturing

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Proceedings Article | 26 February 2018 Presentation + Paper

Presentation + Paper

Explanation of stimulated Raman scattering in high power fiber systems

Victor Bock, Andreas Liem, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10512, 105121F (2018) https://doi.org/10.1117/12.2287770

KEYWORDS: Oscillators, Fiber amplifiers, Amplifiers, Raman scattering, Fiber lasers, Laser systems engineering, Optical amplifiers, High power fiber lasers

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Proceedings Article | 26 February 2018 Presentation + Paper

Presentation + Paper

Mitigation of stimulated Raman scattering in high power fiber lasers using transmission gratings

Maximilian Heck, Victor Bock, Ria Krämer, Daniel Richter, Thorsten Goebel, Christian Matzdorf, Andreas Liem, Thomas Schreiber, Andreas Tünnermann, Stefan Nolte

Proceedings Volume 10512, 105121I (2018) https://doi.org/10.1117/12.2289511

KEYWORDS: Fiber lasers, Signal attenuation, Raman scattering, Refractive index, High power fiber lasers, Optical filters, Ultrafast lasers

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Proceedings Article | 20 February 2018 Open Access

Open Access

Paper

Measurement and removal of cladding light in high power fiber systems

Till Walbaum, Andreas Liem, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10513, 105130U (2018) https://doi.org/10.1117/12.2288266

KEYWORDS: Cladding, Optical testing, High power fiber lasers, High power fiber amplifiers, Structured optical fibers, Refractive index, Waveguides, Packaging, High power lasers, Solid state lasers

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Proceedings Article | 9 March 2016 Paper

Paper

Spatially resolved measurement of the core temperature in a high-power thulium fiber system

Till Walbaum, Matthias Heinzig, Franz Beier, Andreas Liem, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 9728, 97280P (2016) https://doi.org/10.1117/12.2212734

KEYWORDS: Thulium, Fiber amplifiers, Temperature metrology, Fiber lasers, Optical amplifiers, High power fiber amplifiers, High power fiber lasers, Backscatter, Fiber coatings, Absorption, Calibration, Reflectometry

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Proceedings Article | 7 March 2014 Paper

Paper

Analysis of stimulated Raman scattering in cw kW fiber oscillators

T. Schreiber, A. Liem, E. Freier, C. Matzdorf, R. Eberhardt, C. Jauregui, J. Limpert, A. Tünnermann

Proceedings Volume 8961, 89611T (2014) https://doi.org/10.1117/12.2039869

KEYWORDS: Oscillators, Raman scattering, Fiber Bragg gratings, Mirrors, Lawrencium, Fiber lasers, Laser applications, Laser systems engineering, Current controlled current source

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Proceedings Article | 26 February 2013 Paper

Paper

Polarization dependent nonlinear limitations in continuous-wave high power fiber amplifiers

N. Haarlammert, M. Rekas, O. de Vries, A. Kliner, A. Liem, T. Schreiber, R. Eberhardt, A. Tünnermann

Proceedings Volume 8601, 86012W (2013) https://doi.org/10.1117/12.2004362

KEYWORDS: Polarization, Raman spectroscopy, High power fiber amplifiers, Fiber amplifiers, Amplifiers, Neodymium, Raman scattering, Continuous wave operation, Modulation, Nonlinear optics

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Proceedings Article | 26 February 2013 Paper

Paper

Femtosecond pulse inscription of a selective mode filter in large mode area fibers

Ria Krämer, Christian Voigtländer, Erik Freier, Andreas Liem, Jens Thomas, Daniel Richter, Thomas Schreiber, Andreas Tünnermann, Stefan Nolte

Proceedings Volume 8601, 86010S (2013) https://doi.org/10.1117/12.2004349

KEYWORDS: Optical filters, Fiber Bragg gratings, Optical fibers, Refractive index, Femtosecond phenomena, Reflectivity, Cladding, Fiber lasers, Nonlinear filtering, Supercontinuum sources

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Proceedings Article | 16 February 2012 Paper

Paper

26-mJ pulse energy Q-switched large-pitch fiber laser system with excellent beam quality

Florian Jansen, Fabian Stutzki, Andreas Liem, Cesar Jauregui, Jens Limpert, Andreas Tünnermann

Proceedings Volume 8237, 82371S (2012) https://doi.org/10.1117/12.908261

KEYWORDS: Laser systems engineering, Oscillators, Fiber lasers, Fiber amplifiers, Amplifiers, Q switched lasers, Q switching, Optical amplifiers, Photonic crystal fibers, Bragg cells

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Proceedings Article | 11 February 2011 Paper

Paper

Fibers and fiber-optic components for high-power fiber lasers

H. Zimer, M. Kozak, A. Liem, F. Flohrer, F. Doerfel, P. Riedel, S. Linke, R. Horley, F. Ghiringhelli, S. Desmoulins, M. Zervas, J. Kirchhof, S. Unger, S. Jetschke, T. Peschel, T. Schreiber

Proceedings Volume 7914, 791414 (2011) https://doi.org/10.1117/12.879622

KEYWORDS: Fiber lasers, Absorption, Optical fibers, Ytterbium, Phosphorus, Glasses, Refractive index, Aluminum, Cladding, Single mode fibers

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Proceedings Article | 18 February 2010 Paper

Paper

Roadmap to low cost high brightness diode laser power out of the fiber

D. Schröder, E. Werner, A. Franke, L. Wagner, G. Bonati, F. Dörfel, H. Ziemer, A. Liem, T. Gabler

Proceedings Volume 7583, 758309 (2010) https://doi.org/10.1117/12.845841

KEYWORDS: Semiconductor lasers, Fiber lasers, Fiber couplers, Laser marking, Heatsinks, Diodes, Fiber coupled lasers, Laser systems engineering, Mirrors, Collimation

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Proceedings Article | 21 February 2007 Paper

Paper

High-power PCF-based pump combiners

Martin Nielsen, Mads Sørensen, Andreas Liem, Marcin Kozak, Peter Skovgaard

Proceedings Volume 6453, 64532C (2007) https://doi.org/10.1117/12.727087

KEYWORDS: Polymers, Cladding, Fiber lasers, Semiconductor lasers, Diodes, Waveguides, Coating, Photonic crystal fibers, Thermography, Sodium

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Proceedings Article | 23 February 2006 Paper

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

Paper

Q-switching of Yb-doped double-clad fiber laser using micro-optical waveguide on micro-actuating platform modulator for marking applications

Yunsong Jeong, Andreas Liem, Klaus Mörl, Sven Höfer, Youngbok Kim, Andreas Tünnermann, Kyunghwan Oh

Proceedings Volume 6102, 61021K (2006) https://doi.org/10.1117/12.659687

KEYWORDS: Modulators, Modulation, Q switches, Fiber lasers, Ytterbium, Waveguides, Laser marking, Q switched lasers, Switching, Laser applications

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Proceedings Article | 22 April 2005 Paper

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

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 | 22 April 2005 Paper

Paper

High-power diode laser bars as pump sources for fiber lasers and amplifiers

G. Bonati, P. Hennig, D. Wolff, H. Voelckel, T. Gabler, U. Krause, A. Tünnermann, M. Reich, J. Limpert, E. Werner, A. Liem

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.594085

KEYWORDS: Semiconductor lasers, Fiber lasers, Fiber couplers, Reliability, Manufacturing, High power lasers, Pulsed laser operation, Laser applications, Continuous wave operation, Fiber coupled lasers

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Fiber lasers are pumped by fibercoupled, multimode single chip devices at 915nm. That’s what everybody assumes when asked for the type of fiber laser pumps and it was like this for many years. Coming up as an amplifier for telecom applications, the amount of pump power needed was in the range of several watts. Highest pump powers for a limited market entered the ten watts range. This is a range of power that can be covered by highly reliable multimode chips, that have to survive up to 25 years, e.g. in submarine applications. With fiber lasers entering the power range and the application fields of rod and thin disc lasers, the amount of pump power needed raised into the area of several hundred watts. In this area of pump power, usually bar based pumps are used. This is due to the much higher cost pressure of the industrial customers compared to telecom customers. We expect more then 70% of all industrial systems to be pumped by diode laser bars. Predictions that bar based pumps survive for just a thousand hours in cw-operation and fractions of this if pulsed are wrong. Bar based pumps have to perform on full power for 10.000h on Micro channel heat sinks and 20.000h on passive heatsinks in industrial applications, and they do. We will show a variety of data, “real” long time tests and statistics from the JENOPTIK Laserdiode as well as data of thousands of bars in the field, showing that bar based pumps are not just well suitable for industrial applications on high power levels, but even showing benefits compared to chip based pumps. And it’s reasonable, that the same objectives of cost effectiveness, power and lifetime apply as well to thin disc, rod and slab lasers as to fiber lasers. Due to the pumping of fiber lasers, examples will be shown, how to utilize bars for high brightness fiber coupling. In this area, the automation is on its way to reduce the costs on the fibercoupling, similar to what had been done in the single chip business. All these efforts are part of the JENOPTIK Laserdiode’s LongLifeTechnologie.

Proceedings Article | 22 April 2005 Paper

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 | 23 March 2005 Paper

Paper

Fiber-laser power scaling beyond the 1-kilowatt level by Nd:Yb co-doping

Volker Reichel, Klaus Moerl, Sonja Unger, Sylvia Jetschke, Hans-Rainer Mueller, Johannes Kirchhof, Thomas Sandrock, Alexander Harschack, Andreas Liem, Jens Limpert, Holger Zellmer, Andreas Tuennermann

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611066

KEYWORDS: Optical fibers, Energy transfer, Semiconductor lasers, Silica, Neodymium, Materials processing, Laser marking, Fiber lasers, Ytterbium, Absorption

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Proceedings Article | 23 March 2005 Paper

Paper

High-power fiber lasers and amplifiers: perspectives and limitations

Matthias Reich, Andreas Liem, Holger Zellmer, Andreas Tuennermann

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611064

KEYWORDS: Optical fibers, Fiber lasers, Fiber amplifiers, Diffraction, Diffraction gratings, Silica, Cladding, High power fiber lasers, Amplifiers, Solid state lasers

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Proceedings Article | 23 December 2004 Paper

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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Proceedings Article | 7 June 2004 Paper

Paper

High-performance ultrafast fiber laser systems

Jens Limpert, Andreas Liem, Thomas Schreiber, M. Reich, Holger Zellmer, Andreas Tuennermann

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.538774

KEYWORDS: Fiber amplifiers, Fiber lasers, Laser systems engineering, Ultrafast phenomena, Dispersion, Photonic crystal fibers, Oscillators, Cladding, Optical amplifiers, Single mode fibers

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Proceedings Article | 7 June 2004 Paper

Paper

Air-clad large-mode-area photonic crystal fibers: power scaling concepts up to the multi-kW range

Andreas Liem, Jens Limpert, Thomas Schreiber, Stefan Nolte, Holger Zellmer, Andreas Tuennermann, Jes Broeng, Guillaume Vienne, Anders Petersson, Christian Jakobsen, Thomas Peschel, Volker Guyenot, Volker Reichel, Sonja Unger

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.532840

KEYWORDS: Cladding, Fiber lasers, Bridges, Coating, Photonic crystal fibers, Silica, Finite element methods, Continuous wave operation, Absorption, Ytterbium

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Proceedings Article | 3 July 2003 Paper

Paper

Power and energy scaling of fiber laser systems based on ytterbium-doped large-mode-area fibers

Jens Limpert, Andreas Liem, Thomas Schreiber, Holger Zellmer, Andreas Tuennermann

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.484165

KEYWORDS: Fiber amplifiers, Fiber lasers, Continuous wave operation, Amplifiers, Laser systems engineering, Multimode fibers, Ytterbium, Semiconductor lasers, Scattering, Pulsed laser operation

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Proceedings Article | 19 June 2003 Paper

Paper

High-power femtosecond fiber laser systems

Jens Limpert, Thomas Schreiber, Andreas Liem, Holger Zellmer, Andreas Tunnermann

Proceedings Volume 4978, (2003) https://doi.org/10.1117/12.473190

KEYWORDS: Fiber amplifiers, Diffraction gratings, Picosecond phenomena, Femtosecond phenomena, Solitons, Laser systems engineering, Optical amplifiers, Silica, Ultrafast phenomena, Supercontinuum generation

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Showing 5 of 27 publications

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