Dr. Julian Hofmann Profile

Dr. Julian Hofmann

at Ferdinand-Braun-Institut gGmbH

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 4 March 2019 Paper

Miniaturized watt-level laser modules emitting in the yellow-green spectral range for biophotonic applications

A. Sahm, N. Werner, J. Hofmann, D. Jedrzejczyk, D. Feise, K. Paschke

Proceedings Volume 10902, 109020C (2019) https://doi.org/10.1117/12.2511090

KEYWORDS: Second-harmonic generation, Semiconductor lasers, Near infrared, Laser systems engineering, Biophotonic applications, Visible radiation

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Proceedings Article | 23 February 2018 Paper

Miniaturized semiconductor MOPA laser source at 772 nm for the generation of UV laser light

A. Sahm, S. Baumgärtner, J. Hofmann, P. Leisching, K. Paschke

Proceedings Volume 10535, 1053521 (2018) https://doi.org/10.1117/12.2289691

KEYWORDS: Semiconductor lasers, Ultraviolet radiation, Laser sources, Laser systems engineering, Temperature metrology, Collimation, Semiconductors, Light, Deep ultraviolet

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Proceedings Article | 20 February 2018 Presentation + Paper

Intensity noise properties of a compact laser device based on a miniaturized MOPA system for spectroscopic applications

S. Baumgärtner, S. Juhl, D. Opalevs, A. Sahm, J. Hofmann, P. Leisching, K. Paschke

Proceedings Volume 10513, 1051309 (2018) https://doi.org/10.1117/12.2290039

KEYWORDS: Distributed feedback laser diodes, Semiconductor optical amplifiers, Semiconductor lasers, Laser systems engineering, Semiconductors

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Proceedings Article | 19 February 2018 Presentation + Paper

Distributed Bragg reflector tapered diode lasers emitting more than 10 W at 1154 nm

D. Feise, F. Bugge, M. Matalla, A. Thies, P. Ressel, G. Blume, J. Hofmann, K. Paschke

Proceedings Volume 10514, 105140X (2018) https://doi.org/10.1117/12.2290658

KEYWORDS: Semiconductor lasers, Distributed Bragg reflectors, Second-harmonic generation, Light sources

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Proceedings Article | 2 June 2017 Paper

Watt-level yellow emitting lasers by frequency doubling of high power diode lasers

R. Bege, D. Jedrzejczyk, J. Hofmann, G. Blume, D. Feise, F. Bugge, K. Paschke, G. Tränkle

Proceedings Volume 10238, 102380X (2017) https://doi.org/10.1117/12.2264770

KEYWORDS: Semiconductor lasers, Waveguides, Second-harmonic generation, Crystals, Lithium niobate, Absorption, High power diode lasers, Distributed Bragg reflectors, Harmonic generation

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Proceedings Article | 22 February 2017 Paper

Compact diode laser module at 1116 nm with an integrated optical isolation and a PM-SMF output

Daniel Jedrzejczyk, Julian Hofmann, Nils Werner, Alexander Sahm, Katrin Paschke

Proceedings Volume 10085, 1008506 (2017) https://doi.org/10.1117/12.2250526

KEYWORDS: Semiconductor lasers, Single mode fibers, Fiber lasers, Polarization, Light sources, Continuous wave operation, Integrated optics, Laser applications, Waveguides, Aspheric lenses, Waveguide lasers, Collimation, Optical isolators

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Proceedings Article | 22 February 2017 Presentation + Paper

Miniaturized laser amplifier modules for wavelengths of 1180 nm with PM-fiber input and more than 1 W optical output power

Julian Hofmann, Daniel Jedrzejczyk, Alexander Sahm, Nils Werner, Gunnar Blume, Bernd Eppich, David Feise, Frank Bugge, Katrin Paschke

Proceedings Volume 10086, 100860H (2017) https://doi.org/10.1117/12.2250724

KEYWORDS: Semiconductor lasers, Optical amplifiers, Laser amplifiers, Laser optics, High power lasers, Biomedical optics, Spectroscopy, LIDAR, Laser development, Polarization, Distributed Bragg reflectors, Polarization maintaining fibers, Fiber coupled lasers, Fiber amplifiers, Molybdenum, Waveguides, Collimation, Free space, Laser sources, Semiconductor optical amplifiers

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Proceedings Article | 20 February 2017 Paper

Picosecond pulsed micro-module emitting near 560 nm using a frequency doubled gain-switched DBR ridge waveguide semiconductor laser

André Kaltenbach, Julian Hofmann, Dirk Seidel, Kristian Lauritsen, Frank Bugge, Jörg Fricke, Katrin Paschke, Rainer Erdmann, Günther Tränkle

Proceedings Volume 10088, 1008808 (2017) https://doi.org/10.1117/12.2250145

KEYWORDS: Picosecond phenomena, Semiconductor lasers, Waveguides, Second-harmonic generation, Waveguide lasers, Distributed Bragg reflectors, Harmonic generation, Fluorescence spectroscopy, Pulsed laser operation, Picosecond lasers, Nonlinear crystals, Laser sources, Frequency conversion

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Proceedings Article | 7 March 2016 Paper

Master-oscillator power-amplifier in the red spectral range for holographic displays

G. Blume, J. Pohl, D. Feise, J. Wiedmann, P. Ressel, B. Eppich, A. Sahm, A. Ginolas, O. Nedow, M. Jendrzejewski, P. Johne, J. Hofmann, M. Schiemangk, B. Sumpf, G. Erbert, K. Paschke

Proceedings Volume 9770, 97700E (2016) https://doi.org/10.1117/12.2208318

KEYWORDS: Holography, Laser based displays, Optical amplifiers, Semiconductor lasers, Visible radiation, Interferometry, RGB color model, Light sources, Laser development, Distributed Bragg reflectors, Coherence (optics), Amplifiers, Molybdenum, Diffraction, Monochromatic aberrations, Cameras, Signal processing

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Proceedings Article | 4 March 2016 Paper

Comparison of yellow light emitting micro integrated laser modules with different geometries of the crystals for second harmonic generation

Julian Hofmann, Nils Werner, David Feise, Alexander Sahm, Roland Bege, Bernd Eppich, Gunnar Blume, Katrin Paschke

Proceedings Volume 9731, 973109 (2016) https://doi.org/10.1117/12.2208563

KEYWORDS: Crystals, Laser crystals, Harmonic generation, Semiconductor lasers, Laser applications, Laser sources, Optical amplifiers, Oscillators, Reflectors, Confocal microscopy, Near infrared, Amplifiers, Light

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Proceedings Article | 1 April 2015 Paper

Watt-level continuous-wave diode lasers at 1180 nm with high spectral brightness

K. Paschke, G. Blume, O. Brox, Frank Bugge, J. Fricke, D. Feise, Julian Hofmann, H. Wenzel, G. Erbert

Proceedings Volume 9348, 93480X (2015) https://doi.org/10.1117/12.2076340

KEYWORDS: Semiconductor lasers, Second-harmonic generation, Laser applications, Quantum wells, Continuous wave operation, Waveguides, Optics manufacturing, Reflectivity, Distributed Bragg reflectors, Laser development

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Showing 5 of 11 publications

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