Dr. Stephan G. Strohmaier Profile

Dr. Stephan G. Strohmaier

Leiter Diodenvorausentwicklung at TRUMPF Laser GmbH

SPIE Involvement:

Author

Publications (16)

Proceedings Article | 14 March 2023 Presentation + Paper

Presentation + Paper

Tailored in-plane thermal profiles for narrower lateral far-field in kilowatt-class 9xx nm diode laser bars

Md. Jarez Miah, Matthias Karow, Mohamed Elattar, Dominik Martin, Pietro Della Casa, Stefan Grützner, Stephan Strohmaier, Andrea Knigge, Paul Crump, Günther Tränkle

Proceedings Volume 12403, 124030I (2023) https://doi.org/10.1117/12.2648355

KEYWORDS: Design and modelling, Semiconductor lasers, Beam divergence, Resistance, Laser bars, Temperature distribution, Fabrication, Laser resonators, High power lasers, Thermal lensing

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Proceedings Article | 4 March 2022 Presentation + Paper

Presentation + Paper

Progress in experimental studies into the beam parameter product of GaAs-based high-power diode lasers

Paul Crump, Mohamed Elattar, Md. Jarez Miah, Michael Ekterai, Matthias Karow, Dominik Martin, Pietro Della Casa, Andre Maaßdorf, Stewart McDougall, Carlo Holly, Simon Rauch, Stefan Gruetzner, Stephan Strohmaier, Andrea Knigge, Günther Tränkle

Proceedings Volume 11983, 1198307 (2022) https://doi.org/10.1117/12.2610277

KEYWORDS: Semiconductor lasers, High power lasers, Temperature metrology, Continuous wave operation, Near field, Optical testing, Near field optics, Thermography

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Proceedings Article | 7 May 2018 Paper

Paper

Forward development of kW-class power diode laser bars

S. Strohmaier, G. Erbert, T. Rataj, A. H. Meissner-Schenk, V. Loyo-Maldonado, C. Carstens, H. Zimer, B. Schmidt, T. Kaul, M. Karow, M. Wilkens, P. Crump

Proceedings Volume 10514, 1051409 (2018) https://doi.org/10.1117/12.2290382

KEYWORDS: Semiconductor lasers, Continuous wave operation, High power lasers, Laser development, Diodes, High power diode lasers, Waveguide lasers, Resonators, Electro optics

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Proceedings Article | 19 February 2018 Presentation + Paper

Presentation + Paper

Advanced chip designs and novel cooling techniques for brightness scaling of industrial, high power diode laser bars

S. Heinemann, S. McDougall, G. Ryu, L. Zhao, X. Liu, C. Holy, C.-L. Jiang, P. Modak, Y. Xiong, T. Vethake, S. Strohmaier, B. Schmidt, H. Zimer

Proceedings Volume 10514, 105140Y (2018) https://doi.org/10.1117/12.2290638

KEYWORDS: Semiconductor lasers, Reliability, Refractive index, Diodes, Quantum wells, Laser applications, Waveguides, Near field, Packaging, Temperature metrology

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Proceedings Article | 19 February 2018 Paper

Paper

970-nm ridge waveguide diode laser bars for high power DWBC systems

Martin Wilkens, Götz Erbert, Hans Wenzel, Andrea Knigge, Paul Crump, Andre Maaßdorf, Jörg Fricke, Peter Ressel, Stephan Strohmaier, Berthold Schmidt, Günther Tränkle

Proceedings Volume 10514, 105140E (2018) https://doi.org/10.1117/12.2289870

KEYWORDS: Semiconductor lasers, Waveguides, Laser development, Waveguide lasers, Laser systems engineering, High power lasers, Laser processing, Electronic design automation, Fiber lasers, Materials processing

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Proceedings Article | 21 November 2017 Open Access

Open Access

Paper

Mixed garnet laser for a water vapour DIAL

Rainer Treichel, Stephan Strohmaier, Susanne Nikolov, Hans-Joachim Eichler, Eamonn Murphy

Proceedings Volume 10567, 105671H (2017) https://doi.org/10.1117/12.2308051

KEYWORDS: Garnet, Pulsed laser operation, Semiconductor lasers, Absorption, Laser stabilization, Crystals, Clouds, Transmitters, Q switching, Raman spectroscopy

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Proceedings Article | 27 February 2017 Presentation + Paper

Presentation + Paper

kW-class diode laser bars

S. Strohmaier, G. Erbert, A. H. Meissner-Schenk, M. Lommel, B. Schmidt, T. Kaul, M. Karow, P. Crump

Proceedings Volume 10086, 100860C (2017) https://doi.org/10.1117/12.2250383

KEYWORDS: Semiconductor lasers, Laser applications, Continuous wave operation, Laser systems engineering, Laser development, Packaging, Resistance, Resonators, Heatsinks, Electro optics

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Proceedings Article | 13 January 2017 Paper

Paper

High power diode and solid state lasers

H. J. Eichler, H. Fritsche, O. Lux, S. Strohmaier

Proceedings Volume 10254, 102540R (2017) https://doi.org/10.1117/12.2262990

KEYWORDS: Semiconductor lasers, Diodes, Solid state lasers, Fiber lasers, Laser development, High power lasers, Gas lasers, Laser processing, Diode pumped solid state lasers, Laser vision correction

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Proceedings Article | 26 February 2013 Paper

Paper

High brightness laser systems incorporating advanced laser bars

Stephan Strohmaier, Thilo Vethake, Mark Gottdiener, Jens Wunderlin, Viorel Negoita, Yufeng Li, Tobias Barnowski, Tim Gong, Haiyan An, Georg Treusch

Proceedings Volume 8605, 86050J (2013) https://doi.org/10.1117/12.2004927

KEYWORDS: Semiconductor lasers, Laser systems engineering, High power lasers, Disk lasers, Fiber couplers, Laser development, Laser applications, Collimation, Photonics, Solid state lasers

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Proceedings Article | 26 February 2013 Paper

Paper

Advances in high power and high brightness laser bars with enhanced reliability

Haiyan An, Ching-Long (John) Jiang, Yihan Xiong, Aloysius Inyang, Qiang Zhang, Alexander Lewin, Stephan Strohmaier, Georg Treusch

Proceedings Volume 8605, 86050U (2013) https://doi.org/10.1117/12.2004979

KEYWORDS: Reliability, Semiconductor lasers, Polarization, High power lasers, Diodes, Packaging, Laser systems engineering, Plating, Failure analysis, Semiconducting wafers

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The advances in laser-diode technology have enabled high efficiency direct diode base modules to emerge as a building block for industrial high power laser systems. Consequently, these systems have been implemented with advance robust, higher-brightness and reliable laser sources for material processing application. Here at the company, we use low-fill factor bars to build fiber-coupled and passively cooled modules, which form the foundation for “TruDiode,” the series of TRUMPF direct diode laser systems that can perform in the multi-kilowatt arena with high beam quality. However, higher reliable output power, additional efficiency and greater slow axis beam quality of the high power laser bars are necessary to further increase the brightness and reduce the cost of the systems. In order to improve the slow axis beam quality, we have optimized the bar epitaxial structures as well as the lateral design. The detailed near field and far field studies of the slow axis for each individual emitters on the bar provide us with information about the dependency of beam quality as a function of the drive current. Based on these study results for direct diode application, we have optimized the high brightness bar designs at 900-1070nm wavelengths. In addition, high power and high efficiency laser bars with high fill factors have been used to build the pump sources for thin disc laser systems at TRUMPF Photonics. For better system performances with lower costs, we have further optimized bar designs for this application. In this paper, we will give an overview of our recent advances in high power and brightness laser bars with enhanced reliability. We will exhibit beam quality study, polarization and reliability test results of our laser bars in the 900-1070nm wavelengths region for coarse wavelength multiplexing. Finally, we will also present the performance and reliability results of the 200W bar, which will be used for our next generation thin disk laser pump source.

Proceedings Article | 9 February 2012 Paper

Paper

Industrial high-power diode lasers: reliability, power, and brightness

Stephan Strohmaier, Haiyan An, Thilo Vethake

Proceedings Volume 8241, 82410Z (2012) https://doi.org/10.1117/12.906832

KEYWORDS: Semiconductor lasers, Reliability, High power lasers, High power diode lasers, Diodes, Laser development, Structural design, Semiconducting wafers, Product engineering, Collimation

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Proceedings Article | 18 February 2010 Paper

Paper

Dramatic advances in direct diode lasers

David Havrilla, Rüdiger Brockmann, Stephan Strohmaier, Marco Holzer

Proceedings Volume 7583, 75830B (2010) https://doi.org/10.1117/12.843207

KEYWORDS: Semiconductor lasers, Diodes, Fiber lasers, Laser applications, Collimation, Laser processing, Mirrors, Optical pumping, Quality systems, Laser welding

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Proceedings Article | 25 February 2008 Paper

Paper

Passive cooling effects of low and high fill-factor 937 nm 1 cm arrays

John Hostetler, Ching-Long Jiang, Robert Roff, Viorel Negoita, Stephan Strohmaier, Christoph Tillkorn, Radosveta Radionova, Carl Miester, Thilo Vethake, Ulrich Bonna, Martin Huonker, Christian Schmitz, Friedhelm Dorsch

Proceedings Volume 6876, 68760A (2008) https://doi.org/10.1117/12.763443

KEYWORDS: Data modeling, 3D modeling, Diodes, Resistance, Thermal modeling, Semiconductor lasers, Electro optical modeling, Thermal effects, Curium, Copper

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Proceedings Article | 30 April 2007 Paper

Paper

Efficient laser systems for 935 and 942 nm for water vapor lidar

Hans Joachim Eichler, Frank Kallmeyer, Hanjo Rhee, Thomas Riesbeck, Stephan Strohmaier

Proceedings Volume 6346, 63460Y (2007) https://doi.org/10.1117/12.738075

KEYWORDS: Crystals, Pulsed laser operation, Resonators, Raman spectroscopy, Nd:YAG lasers, Absorption, Laser crystals, Diodes, Semiconductor lasers, LIDAR

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Proceedings Article | 20 February 2007 Paper

Paper

Nd:GSAG laser for water vapor detection by lidar near 942 nm

Frank Kallmeyer, Marcus Dziedzina, Daniel Schmidt, Hans-Joachim Eichler, Reiner Treichel, Susanne Nikolov

Proceedings Volume 6451, 64510J (2007) https://doi.org/10.1117/12.700159

KEYWORDS: Semiconductor lasers, Oscillators, Laser crystals, Resonators, Amplifiers, Crystals, Absorption, Laser beam diagnostics, Pulsed laser operation, Telescopes

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Proceedings Article | 10 February 2006 Paper

Paper

Frequency conversion concepts for the efficient generation of high power 935 - 942 nm laser radiation

H. Rhee, T. Riesbeck, F. Kallmeyer, S. Strohmaier, H. Eichler, R. Treichel, K. Petermann

Proceedings Volume 6103, 610308 (2006) https://doi.org/10.1117/12.646263

KEYWORDS: Raman spectroscopy, Absorption, Laser resonators, Crystals, Garnet, Resonators, Mirrors, Semiconductor lasers, Laser crystals, Frequency conversion

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Showing 5 of 16 publications

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