Dr. Stefan W. Heinemann Profile

Dr. Stefan W. Heinemann

Manager at PHIX Photonics Assembly

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (30)

Proceedings Article | 13 March 2024 Presentation

Packaging technologies of integrated photonics

Stefan Heinemann

Proceedings Volume 12867, 1286716 (2024) https://doi.org/10.1117/12.3007483

KEYWORDS: Quantum technologies, Integrated photonics, Photonic integrated circuits, Packaging, Semiconductors, Quantum channels, Photons, Integrated optics, Channel projecting optics, Temperature distribution

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Proceedings Article | 5 March 2021 Presentation

Welcome and Introduction to SPIE Conference 11679

Stefan Heinemann, Stefan Kaierle

Proceedings Volume 11679, 1167902 (2021) https://doi.org/10.1117/12.2592489

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Proceedings Article | 2 March 2020 Presentation + Paper

Advances in diode laser bar power and reliability for multi-kW disk laser pump sources

S. McDougall, T. Barnowski, G. Ryu, S. Heinemann, T. Vethake, X. Liu, C.-L. Jiang, H. Zimer

Proceedings Volume 11262, 1126206 (2020) https://doi.org/10.1117/12.2545995

KEYWORDS: Semiconductor lasers, Disk lasers, Laser applications, Reliability, Laser development, Laser welding, Diodes, Quantum wells

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Proceedings Article | 19 February 2018 Presentation + Paper

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

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

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 | 13 March 2015 Paper

Advancements in high-power high-brightness laser bars and single emitters for pumping and direct diode application

Haiyan An, Ching-Long Jiang, Yihan Xiong, Qiang Zhang, Aloysius Inyang, Jason Felder, Alexander Lewin, Robert Roff, Stefan Heinemann, Berthold Schmidt, Georg Treusch

Proceedings Volume 9348, 93480I (2015) https://doi.org/10.1117/12.2080175

KEYWORDS: Semiconductor lasers, Diodes, Fiber lasers, High power lasers, Laser systems engineering, Reliability, Laser development, Disk lasers, Fiber couplers, Packaging

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Proceedings Article | 13 March 2015 Paper

Packaging of high-power bars for optical pumping and direct applications

Stefan Heinemann, Haiyan An, Tobias Barnowski, Viorel Negoita, Robert Roff, Thilo Vethake, Konstantin Boucke, Georg Treusch, John Jiang

Proceedings Volume 9348, 934807 (2015) https://doi.org/10.1117/12.2080968

KEYWORDS: Packaging, Reliability, Multiplexing, Copper, Optical pumping, Semiconductor lasers, Diodes, Heatsinks, Disk lasers, Ceramics

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Proceedings Article | 28 February 2014 Paper

Increased efficiency of Er:YAG lasers at 1645 nm using narrow bandwidth diode lasers and dual-wavelength resonant pumping

Haro Fritsche, Oliver Lux, Casey Schuett, Stefan Heinemann, Marcus Dziedzina, Wolfgang Gries, Hans Eichler

Proceedings Volume 8959, 895907 (2014) https://doi.org/10.1117/12.2040427

KEYWORDS: Er:YAG lasers, Semiconductor lasers, Methane, Resonators, Absorption, LIDAR, Laser resonators, Diodes, Mirrors, Crystals

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Proceedings Article | 22 October 2013 Paper

Dual-wavelength resonant pumping of compact Er:YAG lasers providing high power output at 1645.55 nm for methane detection

H. Fritsche, O. Lux, C. Schuett, S. Heinemann, W. Gries, H. J. Eichler

Proceedings Volume 8894, 88940A (2013) https://doi.org/10.1117/12.2029088

KEYWORDS: Er:YAG lasers, Semiconductor lasers, Methane, Resonators, Absorption, Fabry–Perot interferometers, Mirrors, Laser development, Crystals, High power lasers

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Proceedings Article | 6 March 2013 Paper

Efficient Er:YAG lasers at 1645.55 nm, resonantly pumped with narrow bandwidth diode laser modules at 1532 nm, for methane detection

H. Fritsche, O. Lux, C. Schuett, S. Heinemann, W. Gries, H. Eichler

Proceedings Volume 8599, 85990G (2013) https://doi.org/10.1117/12.2002333

KEYWORDS: Er:YAG lasers, Methane, Absorption, Semiconductor lasers, Resonators, Continuous wave operation, Fabry–Perot interferometers, Crystals, Q switching, Laser development

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Proceedings Article | 26 February 2013 Paper

Compact high brightness diode laser emitting 500W from a 100μm fiber

Stefan Heinemann, Torsten Schmidt, Wolfgang Gries, Bastian Kruschke, Haro Fritsche

Proceedings Volume 8605, 86050Q (2013) https://doi.org/10.1117/12.2003299

KEYWORDS: Semiconductor lasers, Diodes, Reflectivity, Multiplexing, Resonators, Polarization, Collimation, Optical filters, Electronics, Laser cutting

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Proceedings Article | 31 May 2012 Paper

High-brightness frequency-stabilized diode laser at 1530nm

Benjamin Lewis, Stefan Heinemann, Sandy Sczepansky, Torsten Schmidt

Proceedings Volume 8381, 83810H (2012) https://doi.org/10.1117/12.918041

KEYWORDS: Diodes, Heatsinks, Semiconductor lasers, Collimation, Fiber couplers, Gallium arsenide, Copper, Polarization, Reflectivity, Electro optics

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Proceedings Article | 16 February 2012 Paper

Very high brightness diode laser

Stefan Heinemann, Karsten Michaelis, Torsten Schmidt, Ben Lewis

Proceedings Volume 8241, 82410L (2012) https://doi.org/10.1117/12.908828

KEYWORDS: Semiconductor lasers, Multimode fibers, Multiplexing, Diodes, Polarization, Collimation, Fiber Bragg gratings, Mirrors, Control systems, Electronics

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Proceedings Article | 21 February 2011 Paper

Single emitter based diode lasers with high brightness high power and narrow linewidth

Ben Lewis, Torsten Schmidt, Boris Regaard, Stefan Heinemann

Proceedings Volume 7918, 79180M (2011) https://doi.org/10.1117/12.871955

KEYWORDS: Diodes, Semiconductor lasers, Collimation, Fiber lasers, Reflectivity, Fiber couplers, Resonators, Fiber coupled lasers, Fiber Bragg gratings, Optics manufacturing

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Multiple Single Emitter (MSE) modules allow highest power and highest brightness fiber coupled diode lasers based on standard broad area diodes. 12 single emitters, each rated at 11W, can be stacked in fast axis and yield more than 100W in a fully collimated beam with a beam quality of 7mm*mrad in both axes. Optical transfer efficiencies of >88% from diode facet to after the fiber are achieved resulting in efficient and compact fiber coupled modules. Volume Bragg Gratings (VBG) stabilize the wavelength over a tuning range of >10nm and narrow the linewidth of individual diodes to less than 2nm. The brightness is scaled by polarization multiplexing and optical stacking is deployed for larger fibers resulting in 700W delivered from a 200μm fiber, 0.2 NA. Wall plug efficiencies of 35% are achieved. The challenge of MSE fiber coupled diode lasers lies in high precision, high yield manufacturing and not so much the optical design of the device, since only collimating lenses and a focusing optic are used. However, a large number of individual components must be handled and consistently aligned with high precision. The 100W module comprises 12 single emitters and the 700W/200μm/0.2 laser comprises 120 single emitters with 85% optical fill factor. Pointing tolerances and collimation errors of all emitters cannot exceed 10% of the spot size to realize the benefits of highest brightness from single emitters compared to bars. The two major assembly processes of MSE fiber coupled diode lasers are the precision diode reflow process and the accurate 5 axis alignment of the fast axis collimation lens (FAC). The reflow process enables positioning of 12 single emitter diodes on submounts within +/-5μm on a common heatsink. Special image processing software performs automated precision alignment and fixation of the FAC with a consistent accuracy of better 0.3um and 0.12mrad. It is also deployed for automated alignment of the external VBG. Wavelength stabilization in an external resonator aims to maximize the locking range and to minimize the drop of output power as well as linewidth. Front facet reflectivity of the diode laser, reflectivity of the volume Bragg grating (VBG) and different resonator designs are investigated.

Proceedings Article | 25 February 2009 Paper

Fiber laser microjoining for novel dissimilar material combinations

H. Herfurth, R. Patwa, G. Newaz, R. Baird, S. Ehrenmann, S. Heinemann

Proceedings Volume 7202, 72020H (2009) https://doi.org/10.1117/12.814863

KEYWORDS: Polymers, Laser bonding, Metals, Glasses, Fiber lasers, Packaging, Titanium, Scanning electron microscopy, Interfaces, Combustion

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Proceedings Article | 24 February 2009 Paper

High-brightness fiber-coupled single emitter arrays

Stefan Heinemann, Boris Regaard, Ben Lewis, Torsten Schmidt

Proceedings Volume 7198, 71980Q (2009) https://doi.org/10.1117/12.805620

KEYWORDS: Selenium, Collimation, Image processing, Fiber couplers, Manufacturing, Tolerancing, Reflectivity, Optics manufacturing, Fiber coupled lasers, Polarization

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Proceedings Article | 30 October 2007 Paper

Micromachining with tailored nanosecond pulses

Tim Lauterborn, Stefan Heinemann, Henrikki Pantsar, Hans Herfurth, Rahul Patwa

Proceedings Volume 6796, 67961G (2007) https://doi.org/10.1117/12.778742

KEYWORDS: Silicon, Fiber lasers, Laser ablation, Micromachining, Pulsed laser operation, Pulsed fiber lasers, Fiber amplifiers, Optical amplifiers, Amplifiers, Laser applications

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Proceedings Article | 31 August 2005 Paper

Single transverse mode Yb-doped fiber laser generating up to 0.5mJ/11W with flexible pulse parameters

Stefan Heinemann, Almantas Galvanauskas, Tim Lauterborn

Proceedings Volume 5887, 588705 (2005) https://doi.org/10.1117/12.620926

KEYWORDS: Amplifiers, Fiber lasers, Diodes, Fiber amplifiers, Semiconductor lasers, Laser systems engineering, Optical isolators, Continuous wave operation, Polarization

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Proceedings Article | 22 April 2005 Paper

Linearly polarized high-power fiber lasers with monolithic PM-LMA-fiber and LMA-grating based cavities and their use for nonlinear wavelength conversion

D. Machewirth, S. Heinemann, U. Manyam, V. Khitrov, C. Liu, B. Samson, A. Galvanauskas, K. Tankala

Proceedings Volume 5709, (2005) https://doi.org/10.1117/12.590825

KEYWORDS: Fiber lasers, Polarization, Fiber Bragg gratings, High power fiber lasers, Continuous wave operation, Diffraction, Laser resonators, Chemical oxygen iodine lasers, Diodes, Laser applications

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Proceedings Article | 15 July 2004 Paper

Laser microjoining of dissimilar and biocompatible materials

Hans Herfurth, Stefan Heinemann, Reiner Witte, Gregory Auner, D. Georgiev, Golam Newaz, Ingo Bauer, Ulrich Russek, A. Mian

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.530239

KEYWORDS: Glasses, Titanium, Metals, Polymers, Interfaces, Semiconductor lasers, Silicon, Laser bonding, Ceramics, Biomedical optics

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Proceedings Article | 18 November 2003 Paper

Microjoining of dissimilar materials for life science applications

Stefan Heinemann, Reiner Witte, Hans-Joachim Herfurth

Proceedings Volume 5063, (2003) https://doi.org/10.1117/12.541153

KEYWORDS: Polymers, Glasses, Semiconducting wafers, Laser bonding, Metals, Titanium, Microsystems, Manufacturing, Materials processing, Interfaces

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Proceedings Article | 19 June 2003 Paper

Fiber-coupled high-brightness high-power diode laser for solid-state laser pumping and material processing

Falk Doerfel, Stefan Heinemann, Bodo Ehlers

Proceedings Volume 4973, (2003) https://doi.org/10.1117/12.478369

KEYWORDS: Semiconductor lasers, Laser systems engineering, Solid state lasers, Tolerancing, Transformers, Materials processing, Optical components, Fiber lasers, Beam splitters, Polarization

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Proceedings Article | 18 June 2002 Paper

Laser joining of glass with silicon

Reiner Witte, Stefan Heinemann, Hans-Joachim Herfurth

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470657

KEYWORDS: Silicon, Glasses, Semiconductor lasers, Semiconducting wafers, Laser bonding, Wafer bonding, Nd:YAG lasers, Polishing, Manufacturing, Laser sources

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Proceedings Article | 14 April 2000 Paper

Cylindrical zoom optics for high-power diode lasers

Urban Walz, Stefan Heinemann, Bodo Ehlers

Proceedings Volume 3929, (2000) https://doi.org/10.1117/12.382763

KEYWORDS: Zoom lenses, Semiconductor lasers, High power diode lasers, Optics manufacturing, Optical design, Collimation, Laser applications, Laser optics, Aluminum, Laser sources

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Proceedings Article | 29 March 2000 Paper

Hardening and welding with high-power diode lasers

Stefan Heinemann, Bodo Ehlers, Hans-Joachim Herfurth

Proceedings Volume 3945, (2000) https://doi.org/10.1117/12.380556

KEYWORDS: Semiconductor lasers, Laser welding, Aluminum, Metals, Absorption, Nd:YAG lasers, High power diode lasers, Laser applications, Heat treatments, Process control

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Proceedings Article | 13 May 1998 Paper

Fiber-coupled diode lasers and beam-shaped high-power stacks

Stefan Heinemann, Lars Leininger

Proceedings Volume 3267, (1998) https://doi.org/10.1117/12.308099

KEYWORDS: Semiconductor lasers, Collimation, Beam shaping, Heatsinks, Continuous wave operation, High power diode lasers, Fiber lasers, High power lasers, Diodes

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Proceedings Article | 20 April 1998 Paper

Aging properties of AlGaAs/GaAs high-power diode lasers

Stefan Heinemann, Franz Daiminger, Friedhelm Dorsch

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.306991

KEYWORDS: High power lasers, Semiconductor lasers, Heatsinks, High power diode lasers, Temperature metrology

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Proceedings Article | 20 April 1998 Paper

Monitoring the aging of high-power laser diode arrays

Stefan Heinemann, Christoph Lienau, A. Gerhardt, A. Baerwolff, A. Jaeger, Alexander Richter, J. Donecker, Jens Tomm, Franz Daiminger

Proceedings Volume 3359, (1998) https://doi.org/10.1117/12.306188

KEYWORDS: Diodes, High power lasers, Spectroscopy, Semiconductor lasers, Fourier transforms, Spectroscopes, Near field scanning optical microscopy, GRIN lenses, Spatial resolution, Diagnostics

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Proceedings Article | 1 May 1997 Paper

Aging behavior of high-power laser arrays monitored by photocurrent spectroscopy

Stefan Heinemann, Jens Tomm, Thomas Elsaesser, Uwe Menzel, A. Baerwolff, Ch. Lier, Franz Daiminger

Proceedings Volume 3004, (1997) https://doi.org/10.1117/12.273826

KEYWORDS: GRIN lenses, Spectroscopy, High power lasers, Semiconductor lasers, Absorption, Quantum wells, Cladding, Modulation, Signal generators, Diodes

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Proceedings Article | 10 January 1997 Paper

Laser-based facet inspection system

Ch. Lier, Thomas Elsaesser, Jens Tomm, Franz Daiminger, A. Baerwolff, Stefan Heinemann

Proceedings Volume 3000, (1997) https://doi.org/10.1117/12.263481

KEYWORDS: Inspection, Absorption, Semiconductor lasers, Diodes, Laser systems engineering, Modulation, Spatial resolution, Laser development, Spectroscopy, Doping

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Proceedings Article | 1 July 1990 Paper

Scanning methods for the characterization of infrared glasses

Barbara Luedge, K. Rudolph, Stefan Heinemann, Alfred Reichmann, Dieter Wostl

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34879

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Showing 5 of 30 publications

Proceedings Volume Editor (6)

SPIE Conference Volume | 4 April 2022

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XI

SPIE Conference Volume | 20 April 2021

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X

SPIE Conference Volume | 2 March 2020

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX

SPIE Conference Volume | 7 June 2019

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII

SPIE Conference Volume | 21 May 2018

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VII

Showing 5 of 6 publications

Conference Committee Involvement (31)

High-Power Diode Laser Technology XXIII

25 January 2025 | San Francisco, United States

Components and Packaging for Laser Systems XI

25 January 2025 | San Francisco, United States

High-Power Diode Laser Technology XXII

28 January 2024 | San Francisco, California, United States

High-Power Diode Laser Technology XXI

29 January 2023 | San Francisco, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XI

26 January 2022 | San Francisco, California, United States

High-Power Diode Laser Technology XX

23 January 2022 | San Francisco, California, United States

High-Power Diode Laser Technology XIX

6 March 2021 | Online Only, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X

6 March 2021 | Online Only, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX

5 February 2020 | San Francisco, California, United States

High-Power Diode Laser Technology XVIII

2 February 2020 | San Francisco, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII

6 February 2019 | San Francisco, California, United States

High-Power Diode Laser Technology XVII

3 February 2019 | San Francisco, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VII

31 January 2018 | San Francisco, California, United States

High-Power Diode Laser Technology XVI

29 January 2018 | San Francisco, California, United States

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI

31 January 2017 | San Francisco, California, United States

High-Power Diode Laser Technology XV

30 January 2017 | San Francisco, California, United States

High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V

16 February 2016 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications XIV

15 February 2016 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications XIII

8 February 2015 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications XII

2 February 2014 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications XI

3 February 2013 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications X

22 January 2012 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications IX

23 January 2011 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications VIII

25 January 2010 | San Francisco, California, United States

High-Power Diode Laser Technology and Applications VII

26 January 2009 | San Jose, California, United States

High-Power Diode Laser Technology and Applications VI

21 January 2008 | San Jose, California, United States

High-Power Diode Laser Technology and Applications V

22 January 2007 | San Jose, California, United States

High-Power Diode Laser Technology and Applications IV

23 January 2006 | San Jose, California, United States

High-Power Diode Laser Technology and Applications III

24 January 2005 | San Jose, California, United States

High-Power Diode Laser Technology and Applications II

26 January 2004 | San Jose, Ca, United States

High-Power Diode Laser Technology and Applications

27 January 2003 | San Jose, CA, United States

Showing 5 of 31 Conference Committees

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