Dr. Karl Unterrainer Profile

Dr. Karl Unterrainer

at Technische Universitaet Wien

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 13 March 2024 Presentation

Broadband THz quantum cascade lasers and arrays

Michael Jaidl, Marie Ertl, Max Beiser, Anna Invernici, Benedikt Limbacher, Sebastian Schoenhuber, Juraj Darmo, Max Andrews, Karl Unterrainer

Proceedings Volume PC12905, PC129050J (2024) https://doi.org/10.1117/12.3000873

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Optical alignment, Laser resonators, Design and modelling, Waveguides, Quantum sources, Quantum operations, Frequency combs, Fabry–Perot interferometers

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

Terahertz quantum cascade ring lasers: comb operation and integration on Si-substrates

M. Jaidl, N. Opačak, M. Kainz, M. Ertl, D. Theiner, B. Limbacher, M. Beiser, M. Giparakis, M. Andrews, G. Strasser, B. Schwarz, J. Darmo, K. Unterrainer

Proceedings Volume PC12440, PC124400Q (2023) https://doi.org/10.1117/12.2648329

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Silicon, Resonators, Frequency combs, Waveguides, Phonons, Nonlinear optics, Laser damage threshold, Integrated optics

Read Abstract +

Proceedings Article | 9 March 2022 Presentation

THz quantum cascade laser circuits

Benedikt Limbacher, Michael Jaidl, Marie Ertl, Martin Kainz, Sebastian Schönhuber, Juraj Darmo, Aaron Andrews, Gottfried Strasser, Karl Unterrainer

Proceedings Volume PC12021, PC120210C (2022) https://doi.org/10.1117/12.2607148

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Switching, Random lasers, Quantum efficiency, Frequency combs, Electron transport, Aluminum

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

High performance and control of THz quantum cascade lasers (Conference Presentation)

Martin Kainz, Sebastian Schönhuber, Michael Jaidl, Gottfried Strasser, Maxwell Andrews, Juraj Darmo, Karl Unterrainer

Proceedings Volume 11301, 113011J (2020) https://doi.org/10.1117/12.2543386

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Indium gallium arsenide, Switching, Gallium arsenide, Doping, Metals, Aluminum, Thermoelectric materials, Magnetism

Read Abstract +

Proceedings Article | 7 March 2019 Paper

Acousto-optically Q-switched diode side-pumped Er:YLF laser generating 50-kW peak power in 70-ns pulses

Manuel Messner, Arne Heinrich, Clemens Hagen, Karl Unterrainer

Proceedings Volume 10896, 1089607 (2019) https://doi.org/10.1117/12.2508243

KEYWORDS: Erbium lasers, Acousto-optics, Ablative surgery, Nonlinear crystals, Q switching, Diodes, Q switches, Q switched lasers, Bragg cells, Pulsed laser operation, Laser crystals, Absorption

Read Abstract +

Proceedings Article | 15 February 2018 Paper

High-energy diode side-pumped Er:YLF laser generating 100 mJ @ 100 Hz

Manuel Messner, Arne Heinrich, Clemens Hagen, Karl Unterrainer

Proceedings Volume 10511, 105110J (2018) https://doi.org/10.1117/12.2288134

KEYWORDS: Pulsed laser operation, Laser crystals, Laser dentistry, Laser systems engineering, Laser resonators, Diode pumped solid state lasers, Erbium lasers, Q switched lasers, Dermatology

Read Abstract +

Proceedings Article | 14 February 2017 Presentation + Paper

Seeing laser scalpel: a novel monolithic high-power diode pumped Tm:YAG laser system at 2.02 µm with double-clad fiber combined OCT

Manuel Messner, Arne Heinrich, Clemens Hagen, Karl Unterrainer

Proceedings Volume 10054, 100540X (2017) https://doi.org/10.1117/12.2250779

KEYWORDS: Fiber lasers, Optical coherence tomography, Pulsed laser operation, Surgery, Semiconductor lasers, Diodes, High power lasers, Endoscopy, Laser systems engineering, Fiber couplers

Read Abstract +

Proceedings Article | 16 March 2016 Paper

High brightness diode pumped Er:YAG laser system at 2.94 µm with nearly 1kW peak power

Manuel Messner, Arne Heinrich, Clemens Hagen, Karl Unterrainer

Proceedings Volume 9726, 972602 (2016) https://doi.org/10.1117/12.2209098

KEYWORDS: Diodes, Er:YAG lasers, Laser systems engineering, Fiber couplers, Diode pumped solid state lasers, Laser cutting, Thermal effects, Resonators, Mid-IR, Erbium, Erbium lasers, Medical laser equipment, Laser dentistry, Temperature metrology, Laser resonators, Surgery, Laser development

Read Abstract +

Proceedings Article | 4 March 2013 Paper

Towards nanowire-based terahertz quantum cascade lasers: prospects and technological challenges

Michael Krall, Martin Brandstetter, Christoph Deutsch, Hermann Detz, Tobias Zederbauer, Aaron Maxwell Andrews, Werner Schrenk, Gottfried Strasser, Karl Unterrainer

Proceedings Volume 8640, 864018 (2013) https://doi.org/10.1117/12.2004545

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Waveguides, Reactive ion etching, Measurement devices, Nanolithography, Etching, Photomasks, Metals, Nanowires

Read Abstract +

Proceedings Article | 23 February 2012 Paper

Upper band operation of active photonic crystal terahertz lasers

A. Benz, M. Brandstetter, C. Deutsch, H. Detz, A. Andrews, W. Schrenk, G. Strasser, K. Unterrainer

Proceedings Volume 8261, 82610M (2012) https://doi.org/10.1117/12.908232

KEYWORDS: Photonic crystals, Waveguides, Resonators, Laser crystals, Terahertz radiation, Refractive index, Quantum cascade lasers, Active optics, Phonons, Crystals

Read Abstract +

Proceedings Article | 6 February 2012 Paper

Fluorescence enhancements and spectral modifications near the cut-off frequency of plasmonic structure

Kareem Elsayad, Alexander Urich, Maria Nemethova, John Small, Karl Unterrainer, Katrin Heinze

Proceedings Volume 8234, 82340W (2012) https://doi.org/10.1117/12.909084

KEYWORDS: Luminescence, Silver, Molecules, Absorption, Energy transfer, Proteins, Metals, Quartz, Resolution enhancement technologies, Silicon

Read Abstract +

Proceedings Article | 11 September 2010 Paper

Fast near-field imaging of spectrally broad sources using layered metallic structures

Kareem Elsayad, Alexander Urich, Karl Unterrainer, Katrin Heinze

Proceedings Volume 7757, 77573M (2010) https://doi.org/10.1117/12.860940

KEYWORDS: Modulation transfer functions, Diffraction gratings, Phase transfer function, Super resolution, Diffraction, Spatial frequencies, Near field, Wave propagation, Image resolution, Luminescence

Read Abstract +

Proceedings Article | 28 August 2010 Paper

Surface-emitting terahertz quantum cascade ring lasers

C. Deutsch, E. Mujagić, A. Benz, A. Andrews, P. Klang, H. Detz, W. Schrenk, G. Strasser, K. Unterrainer

Proceedings Volume 7763, 776305 (2010) https://doi.org/10.1117/12.860583

KEYWORDS: Waveguides, Quantum cascade lasers, Metals, Terahertz radiation, Polarization, Phase shifts, Optical testing, Fiber Bragg gratings, Sensors, Laser development

Read Abstract +

Proceedings Article | 19 August 2010 Paper

Microdisk THz quantum-cascade lasers with super-conducting cavities

A. Benz, M. Brandstetter, C. Deutsch, G. Fasching, A. Andrews, P. Klang, W. Schrenk, G. Strasser, K. Unterrainer

Proceedings Volume 7763, 776303 (2010) https://doi.org/10.1117/12.860475

KEYWORDS: Superconductors, Waveguides, Niobium, Terahertz radiation, Metals, Surface plasmons, Interfaces, Resonators, Temperature metrology, Semiconductors

Read Abstract +

Proceedings Article | 12 February 2010 Paper

Ring resonator-based surface emitting quantum cascade lasers

E. Mujagic, C. Schwarzer, M. Nobile, H. Detz, S. Ahn, P. Klang, A. Andrews, W. Schrenk, C. Deutsch, K. Unterrainer, J. Chen, C. Gmachl, G. Strasser

Proceedings Volume 7616, 76161Q (2010) https://doi.org/10.1117/12.842703

KEYWORDS: Quantum cascade lasers, Terahertz radiation, Resonators, Laser damage threshold, Fabry–Perot interferometers, Continuous wave operation, Waveguides, Laser resonators, Beam shaping, Measurement devices

Read Abstract +

Proceedings Article | 14 February 2008 Paper

Advances in fiber delivery of ultrashort pulses at 800 nm

T. Le, M. Hofer, Z. Cheng, A. Stingl, J. Darmo, D. Kelly, K. Unterrainer

Proceedings Volume 6871, 68712C (2008) https://doi.org/10.1117/12.763150

KEYWORDS: Prisms, Dispersion, Mirrors, Terahertz radiation, Ultrafast phenomena, Fiber lasers, Photonic crystal fibers, Single mode fibers, Sapphire lasers, Femtosecond phenomena

Read Abstract +

Proceedings Article | 25 September 2007 Paper

Fast numerical algorithm for ultrashort THz pulse diffraction

Damien Kelly, Bryan Hennelly, Alexander Grün, Juraj Darmo, Karl Unterrainer

Proceedings Volume 6697, 66970Q (2007) https://doi.org/10.1117/12.735531

KEYWORDS: Diffraction, Terahertz radiation, Fourier transforms, Ultrafast phenomena, Error analysis, Spectroscopy, Near field diffraction, Gaussian pulse, Numerical analysis, Confocal microscopy

Read Abstract +

Proceedings Article | 18 November 2005 Paper

Microcavity terahertz quantum-cascade laser

G. Fasching, A. Benz, R. Zobl, A. Andrews, T. Roch, W. Schrenk, G. Strasser, V. Tamosiunas, K. Unterrainer

Proceedings Volume 6010, 601006 (2005) https://doi.org/10.1117/12.630625

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Waveguides, Resonators, Finite-difference time-domain method, Microrings, Gallium arsenide, Gallium, Metals, Optical microcavities

Read Abstract +

Proceedings Article | 16 June 2004 Paper

Coherent vs. incoherent charge transport in semiconductor quantum cascade structures

Michael Woerner, Felix Eickemeyer, Klaus Reimann, Thomas Elsaesser, Stefano Barbieri, Carlo Sirtori, T. Mueller, Rudolf Bratschitsch, Karl Unterrainer, G. Strasser

Proceedings Volume 5352, (2004) https://doi.org/10.1117/12.527512

KEYWORDS: Quantum cascade lasers, Electron transport, Scattering, Electroluminescence, Ultrafast phenomena, Fourier transforms, Femtosecond phenomena, Wave propagation, Solids, Superposition

Read Abstract +

Proceedings Article | 19 June 2003 Paper

Compact THz-source based on femtosecond Ti:sapphire laser and intracavity photoconductive emitter

Tuan Le, Gabriel Tempea, Andreas Stingl, Juraj Darmo, Gottfried Strasser, Karl Unterrainer

Proceedings Volume 4978, (2003) https://doi.org/10.1117/12.478593

KEYWORDS: Terahertz radiation, Mirrors, Mode locking, Reflectivity, Antennas, Gallium arsenide, Oscillators, Semiconductors, Crystals, Sapphire lasers

Read Abstract +

Proceedings Article | 11 June 2002 Paper

Terahertz emission from magnetoplasma oscillations in semiconductors

James Heyman, H. Wrage, C. Lind, D. Hebert, P Neocleous, P. Crowell, T. Mueller, Karl Unterrainer

Proceedings Volume 4643, (2002) https://doi.org/10.1117/12.470418

KEYWORDS: Terahertz radiation, Magnetism, Indium arsenide, Plasma, Quantum wells, Motion models, Gallium arsenide, Semiconductors, 3D modeling, Magnetic semiconductors

Read Abstract +

Proceedings Article | 22 May 2002 Paper

Quantum cascade lasers and metal waveguides at lambda > 20 m

Raffaele Colombelli, Federico Capasso, Karl Unterrainer, Claire Gmachl, A. Sergent, Deborah Sivco, Alfred Cho

Proceedings Volume 4651, (2002) https://doi.org/10.1117/12.467942

KEYWORDS: Waveguides, Quantum cascade lasers, Laser damage threshold, Laser scattering, Metals, Dielectrics, Absorption, Indium gallium arsenide, Resonators, Scattering

Read Abstract +

Proceedings Article | 1 March 2001 Paper

Gas absorption spectroscopy using GaAs/AlGaAs quantum cascade lasers and a hollow waveguide absorption cell

Lubos Hvozdara, Stefan Gianordoli, Gottfried Strasser, Werner Schrenk, Karl Unterrainer, Erich Gornik, V. Pustogov, Chavali Murthy, Martin Kraft, Boris Mizaikoff, Alexandra Inberg, Nathan Croitoru

Proceedings Volume 4204, (2001) https://doi.org/10.1117/12.417417

KEYWORDS: Absorption, Quantum cascade lasers, Spectroscopy, Hollow waveguides, Helium, Mid-IR, Laser applications, Laser spectroscopy, Pulsed laser operation, Chlorine

Read Abstract +

Proceedings Article | 9 September 1999 Paper

Plasmon-based terahertz laser without population inversion

Krzysztof Kempa, Pradip Bakshi, Mikael Ciftan, Erich Gornik, Karl Unterrainer, Gottfried Strasser, C. Rauch

Proceedings Volume 3828, (1999) https://doi.org/10.1117/12.361029

KEYWORDS: Plasma, Quantum wells, Plasmons, Terahertz radiation, Solids, Semiconductors, Structural design, Nanostructures, Electromagnetic radiation, Solid state physics

Read Abstract +

Proceedings Article | 9 September 1999 Paper

GaAs AlGaAs intersubband MIR lasers

Lubos Hvozdara, Stefan Gianordoli, Werner Schrenk, Gottfried Strasser, Karl Unterrainer, Erich Gornik

Proceedings Volume 3828, (1999) https://doi.org/10.1117/12.361052

KEYWORDS: Quantum cascade lasers, Superlattices, Gallium arsenide, Solids, Mid-IR, Semiconductors, Aluminum, Waveguides, Cladding, Surgery

Read Abstract +

Proceedings Article | 1 October 1991 Paper

Tunable cyclotron-resonance laser in germanium

Christian Kremser, Karl Unterrainer, Erich Gornik, Gottfried Strasser, Carl Pidgeon

Proceedings Volume 1501, (1991) https://doi.org/10.1117/12.46863

KEYWORDS: Magnetism, Chromium, Germanium, Sensors, Absorption, Phonons, Magnetic sensors, Light scattering, Mirrors, Scattering

Read Abstract +

Proceedings Article | 1 October 1990 Paper

First observation of 2P-magnetoexcitons in GaAs/AlGaAs multiple quantum wells via two-photon absorption processes

Metha Nithisoontorn, Karl Unterrainer, S. Michaelis, Erich Gornik, Nobuhiko Sawaki, Hiroyuki Kano

Proceedings Volume 1283, (1990) https://doi.org/10.1117/12.20758

KEYWORDS: Excitons, Quantum wells, Magnetism, Absorption, Hydrogen, Zeeman effect, Chemical species, Physics, Polarization, Active optics

Read Abstract +

Showing 5 of 27 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years