Dr. Patrick Leisching Profile

Dr. Patrick Leisching

Chief Technology Officer at iThera Medical GmbH

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 5 March 2022 Open Access

Open Access

Presentation + Paper

Flip-chip-integrated silicon nitride ECL at 640nm with relaxed alignment tolerances

Ines Kluge, Michael Schulten, Alireza Tabatabaei Mashayekh, Rebecca Rodrigo, Manuel Ackermann, Ibrahim Ghannam, Andim Stassen, Florian Merget, Patrick Leisching, Jeremy Witzens

Proceedings Volume 12006, 120060E (2022) https://doi.org/10.1117/12.2607615

KEYWORDS: Photonic integrated circuits, Waveguides, Tolerancing, Silicon, Semiconductor lasers, Assembly tolerances, Optical alignment, Visible radiation

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Proceedings Article | 2 March 2020 Paper

Paper

Fast thickness gauging with an ECOPS-based terahertz time-domain system

M. Yahyapour, A. Jahn, K. Dutzi, T. Puppe, P. Leisching, B. Schmauss, N. Vieweg, A. Deninger

Proceedings Volume 11279, 112790O (2020) https://doi.org/10.1117/12.2546020

KEYWORDS: Terahertz radiation, Antennas, Terahertz spectroscopy

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Proceedings Article | 2 March 2020 Paper

Paper

Stabilized OEM diode-laser system for metrology applications

Christian Nölleke, Niklas Kolodzie, Lisa Winkler, Hendrick Thiem, Matthias Reggentin, Patrick Leisching

Proceedings Volume 11287, 1128706 (2020) https://doi.org/10.1117/12.2546126

KEYWORDS: Optical isolators, Semiconductor lasers, Diodes, Laser stabilization, Laser systems engineering, Spectroscopy, Laser applications, Fiber couplers

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Proceedings Article | 14 February 2020 Paper

Paper

Frequency-tunable two-color ultrafast fiber laser for nonlinear excitation of NADH and FAD

Axel Friedenauer, Konrad Birkmeier, Andreas Brodschelm, Max Eisele, Christoph Skrobol, Patrick Leisching

Proceedings Volume 11244, 112441M (2020) https://doi.org/10.1117/12.2546120

KEYWORDS: Fiber lasers, Laser systems engineering, Microscopy, Multiphoton microscopy, Ultrafast phenomena, Tunable lasers, Multiphoton fluorescence microscopy, Photonics, Femtosecond fiber lasers

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Proceedings Article | 14 February 2020 Presentation + Paper

Presentation + Paper

Metabolic imaging by simultaneous 2-photon FLIM of NAD(P)H and FAD

Wolfgang Becker, Axel Bergmann, Alexander Jelzow, Antje Neubauer, Angelika Rück, Konrad Birkmeier, Patrick Leisching

Proceedings Volume 11244, 112440L (2020) https://doi.org/10.1117/12.2550962

KEYWORDS: Fluorescence lifetime imaging, Multiplexing, Second-harmonic generation, Sensors, Photons, Imaging systems, Picosecond phenomena, Femtosecond fiber lasers, Luminescence, Ultrafast phenomena

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Proceedings Article | 4 March 2019 Paper

Paper

True OEM terahertz systems for industrial applications

N. Vieweg, A. Deninger, P. Leisching

Proceedings Volume 10925, 109250U (2019) https://doi.org/10.1117/12.2511268

KEYWORDS: Terahertz radiation, Spectroscopy, Sensors, Receivers, Terahertz spectroscopy, Femtosecond phenomena

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Proceedings Article | 4 March 2019 Open Access

Open Access

Paper

Miniaturized PIC multi-color laser engines for the life sciences

Alireza Mashayekh, Thomas Klos, Sina Koch, Florian Merget, Douwe Geuzebroek, Edwin Klein, Theo Veenstra, Martin Büscher, Patrick Leisching, Jeremy Witzens

Proceedings Volume 10922, 109221U (2019) https://doi.org/10.1117/12.2507225

KEYWORDS: Waveguides, Photonic integrated circuits, Interfaces, Semiconductor lasers, Life sciences, Reliability, Lenses, Diffraction, Signal attenuation, Modulation, Biophotonic applications, Flow cytometry, Confocal fluorescent microscopy, Stimulated emission depletion microscopy

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Proceedings Article | 4 March 2019 Paper

Paper

Design and realization of future compact external-cavity diode laser systems

S. Baumgärtner, A. Matteo, N. Kolodzie, C. Nölleke, C. Raab, P. Leisching

Proceedings Volume 10899, 108990D (2019) https://doi.org/10.1117/12.2509620

KEYWORDS: Semiconductor lasers, Laser systems engineering, Resonators, Quantum communications, Laser applications, Optical design, Bandpass filters, Mirrors

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Proceedings Article | 20 March 2018 Paper

Paper

Enabling proximity mask-aligner lithography with a 193nm CW light source

Raoul Kirner, Andreas Vetter, Dmitrijs Opalevs, Matthias Scholz, Patrick Leisching, Toralf Scharf, Wilfried Noell, Carsten Rockstuhl, Reinhard Voelkel

Proceedings Volume 10587, 105871F (2018) https://doi.org/10.1117/12.2297171

KEYWORDS: Lithography, Diffusers, Diffractive optical elements, Lithographic illumination, Continuous wave operation, Semiconductor lasers, 193nm lithography, Beam shaping, Microlens array, Light sources and illumination

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Proceedings Article | 20 March 2018 Paper

Paper

Mask-aligner Talbot lithography using a 193nm CW light source

Andreas Vetter, Raoul Kirner, Dmitrijs Opalevs, Matthias Scholz, Patrick Leisching, Toralf Scharf, Wilfried Noell, Carsten Rockstuhl, Reinhard Voelkel

Proceedings Volume 10587, 105870W (2018) https://doi.org/10.1117/12.2296503

KEYWORDS: Photomasks, Lithography, Lithographic illumination, Semiconducting wafers, Light sources, Semiconductor lasers, Beam shaping, Continuous wave operation, Crystals, Diffusers

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Proceedings Article | 23 February 2018 Paper

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 | 22 February 2018 Paper

Paper

Frequency locking of compact laser-diode modules at 633 nm

Christian Nölleke, Patrick Leisching, Gunnar Blume, Daniel Jedrzejczyk, Johannes Pohl, David Feise, Alexander Sahm, Katrin Paschke

Proceedings Volume 10539, 1053907 (2018) https://doi.org/10.1117/12.2290157

KEYWORDS: Semiconductor lasers, Optical isolators, Diodes, Absorption, Laser stabilization, Oscillators, Temperature metrology, Signal processing, Gas lasers, Photodiodes

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Proceedings Article | 22 February 2018 Presentation + Paper

Presentation + Paper

633-nm single-mode master-oscillator power-amplifier module

G. Blume, D. Jedrzejczyk, J. Pohl, D. Feise, A. Sahm, N. Werner, C. Nölleke, P. Leisching, K. Paschke

Proceedings Volume 10528, 105280D (2018) https://doi.org/10.1117/12.2286455

KEYWORDS: Optical isolators, Iodine, Polarization, Optical amplifiers, Semiconductor lasers, Laser stabilization, Waveguides, Cladding, Absorption, Helium neon lasers, Group III-V semiconductors, Distributed Bragg reflectors, Micro optics, Polarization maintaining fibers

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Proceedings Article | 20 February 2018 Presentation + Paper

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 | 15 February 2018 Paper

Paper

Semiconductor-based narrow-line and high-brilliance 193-nm laser system for industrial applications

D. Opalevs, M. Scholz, J. Stuhler, C. Gilfert, L. J. Liu, X. Y. Wang, A. Vetter, R. Kirner, T. Scharf, W. Noell, C. Rockstuhl, R. K. Li, C. T. Chen, R. Voelkel, P. Leisching

Proceedings Volume 10511, 105112C (2018) https://doi.org/10.1117/12.2290288

KEYWORDS: Laser systems engineering, Crystals, Deep ultraviolet, Lithography, Semiconductor lasers, Laser applications, Continuous wave operation, Nonlinear crystals, Photomasks, Laser crystals

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Proceedings Article | 2 March 2017 Open Access

Open Access

Paper

Photonic integrated circuits for multi-color laser engines

Sebastian Romero-García, Thomas Klos, Edwin Klein, Jonas Leuermann, Douwe Geuzebroek, Joost van Kerkhof, Martin Büscher, Jürgen Krieg, Patrick Leisching, Jeremy Witzens

Proceedings Volume 10108, 101080Z (2017) https://doi.org/10.1117/12.2250758

KEYWORDS: Photonic integrated circuits, Flow cytometry, Free space optics, Waveguides, Polarization, Switches, Modulation, Interfaces, Free space, Wave propagation

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Proceedings Article | 17 February 2017 Paper

Paper

Compact single-mode diode laser in the visible spectral range

Christian Nölleke, Patrick Leisching, Gunnar Blume, Daniel Jedrzejczyk, Johannes Pohl, David Feise, Alexander Sahm, Katrin Paschke

Proceedings Volume 10082, 1008225 (2017) https://doi.org/10.1117/12.2252156

KEYWORDS: Semiconductor lasers, Optical isolators, Semiconductors, Integrated optics, Visible radiation, Optical metrology, Interferometry, Distance measurement, Laser applications, Laser metrology, Polarizers, Crystals, Manganese, Laser stabilization, Laser scattering, Polarization, Absorption

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Proceedings Article | 16 February 2017 Paper

Paper

633-nm single-mode laser diode module with PM fiber output

G. Blume, D. Jedrzejczyk, J. Pohl, D. Feise, A. Sahm, B. Eppich, C. Nölleke, P. Leisching, K. Paschke

Proceedings Volume 10100, 1010018 (2017) https://doi.org/10.1117/12.2250763

KEYWORDS: Semiconductor lasers, Optical isolators, Beam shaping, Phase modulation, Fiber couplers, Optical filters, Single mode fibers, Waveguides, Indium gallium phosphide, Fiber coupled lasers, Polarization, Optical testing, Laser development, Aspheric lenses

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Proceedings Article | 8 October 2015 Paper

Paper

Robust remote-pumping sodium laser for advanced LIDAR and guide star applications

Bernhard Ernstberger, Martin Enderlein, Axel Friedenauer, Robin Schwerdt, Daoping Wei, Vladimir Karpov, Patrick Leisching, Wallace Clements, Wilhelm Kaenders

Proceedings Volume 9641, 96410F (2015) https://doi.org/10.1117/12.2194874

KEYWORDS: Lasers, Laser systems engineering, Fiber lasers, Electronics, Laser guide stars, Second-harmonic generation, Stars, Sodium, Telescopes, Wavefronts

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The performance of large ground-based optical telescopes is limited due to wavefront distortions induced by atmospheric turbulence. Adaptive optics systems using natural guide stars with sufficient brightness provide a practical way for correcting the wavefront errors by means of deformable mirrors. Unfortunately, the sky coverage of bright stars is poor and therefore the concept of laser guide stars was invented, creating an artificial star by exciting resonance fluorescence from the mesospheric sodium layer about 90 km above the earth’s surface. Until now, mainly dye lasers or sumfrequency mixing of solid state lasers were used to generate laser guide stars. However, these kinds of lasers require a stationary laser clean room for operation and are extremely demanding in maintenance. Under a development contract with the European Southern Observatory (ESO) and W. M. Keck Observatory (WMKO), TOPTICA Photonics AG and its partner MPB Communications have finalized the development of a next-generation sodium guide star laser system which is available now as a commercial off-the-shelf product. The laser is based on a narrow-band diode laser, Raman fiber amplifier (RFA) technology and resonant second-harmonic generation (SHG), thus highly reliable and simple to operate and maintain. It emits > 22 W of narrow-linewidth (≈ 5 MHz) continuous-wave radiation at sodium resonance and includes a re-pumping scheme for boosting sodium return flux. Due to the SHG resonator acting as spatial mode filter and polarizer, the output is diffraction-limited with RMS wavefront error < λ/25. Apart from this unique optical design, a major effort has been dedicated to integrating all optical components into a ruggedized system, providing a maximum of convenience and reliability for telescope operators. The new remote-pumping architecture allows for a large spatial separation between the main part of the laser and the compact laser head. Together with a cooling-water flow of less than 5 l/min and an overall power consumption of < 700 W, the system offers a maximum of flexibility with minimal infrastructure demands on site. Each system is built in a modular way, based on the concept of line-replaceable units (LRU). A comprehensive system software, as well as an intuitive service GUI, allow for remote control and error tracking down to at least the LRU level. In case of a failure, any LRU can be easily replaced. With these fiber-based guide star lasers, TOPTICA for the first time offers a fully engineered, off-the-shelf guide star laser system for groundbased optical telescopes providing convenient, turn-key operation in remote and harsh locations. Reliability and flexibility will be beneficial in particular for advanced satellite and space debris tracking as well as LIDAR applications.

Proceedings Article | 21 July 2014 Paper

Paper

Series production of next-generation guide-star lasers at TOPTICA and MPBC

Martin Enderlein, Axel Friedenauer, Robin Schwerdt, Paul Rehme, Daoping Wei, Vladimir Karpov, Bernhard Ernstberger, Patrick Leisching, Wallace R. Clements, Wilhelm Kaenders

Proceedings Volume 9148, 914807 (2014) https://doi.org/10.1117/12.2055059

KEYWORDS: Fiber lasers, Control systems, Telescopes, Laser systems engineering, Semiconductor lasers, Electronics, Second-harmonic generation, Laser safety, Radiofrequency ablation, Lasers

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Proceedings Article | 20 February 2014 Paper

Paper

CW emission at 193 nm using an all solid-state laser source

Matthias Scholz, Dmitrijs Opalevs, Jürgen Stuhler, Patrick Leisching, Wilhelm Kaenders, Guiling Wang, Xiaoyang Wang, Rukang Li, Chuangtian Chen

Proceedings Volume 8964, 896402 (2014) https://doi.org/10.1117/12.2037191

KEYWORDS: Deep ultraviolet, Crystals, Laser sources, Nonlinear crystals, Continuous wave operation, Semiconductor lasers, Spectroscopy, Laser systems engineering, Ultraviolet radiation, Solid state lasers

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Proceedings Article | 27 March 2013 Paper

Paper

A narrow-band continuous-wave laser source at 191 nm

Matthias Scholz, Dmitrijs Opalevs, Jürgen Stuhler, Patrick Leisching, Wilhelm Kaenders, Guiling Wang, Xiaoyang Wang, Rukang Li, Chuangtian Chen

Proceedings Volume 8604, 860402 (2013) https://doi.org/10.1117/12.2001500

KEYWORDS: Deep ultraviolet, Nonlinear crystals, Crystals, Second-harmonic generation, Continuous wave operation, Amplifiers, Light sources, Absorption, Laser sources, Birefringence

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Proceedings Article | 11 February 2011 Paper

Paper

Generation of 30 fs pulses at 670 nm using a frequency-doubled fiber laser system and a photonic-crystal fiber with two zero-dispersion wavelengths

Robert Herda, Tobias Junggeburth, Kim Per Hansen, Patrick Leisching

Proceedings Volume 7914, 791429 (2011) https://doi.org/10.1117/12.874215

KEYWORDS: Dispersion, Photonic crystal fibers, Fiber lasers, Prisms, Femtosecond phenomena, Pulse shaping, Solitons, Laser systems engineering, Structured optical fibers, Photons

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Proceedings Article | 25 October 2005 Paper

Paper

The vision of optical networking: tales and realities of the OPEX/CAPEX analysis

Patrick Leisching

Proceedings Volume 6011, 601103 (2005) https://doi.org/10.1117/12.640098

KEYWORDS: Optical fibers, Wavelength division multiplexing, Optical amplifiers, Interfaces, Optical networks, Transponders, Transparent conductors, Networks, Optical components

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Showing 5 of 24 publications

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