Zobrazeno 1 - 10
of 349
pro vyhledávání: '"Holger T. Grahn"'
Autor:
Martin Hempel, Benjamin Röben, Michael Niehle, Lutz Schrottke, Achim Trampert, Holger T. Grahn
Publikováno v:
AIP Advances, Vol 7, Iss 5, Pp 055201-055201-6 (2017)
The dynamical tuning due to rear facet illumination of single-mode, terahertz (THz) quantum-cascade lasers (QCLs) which employ distributed feedback gratings are compared to the tuning of single-mode QCLs based on two-section cavities. The THz QCLs un
Externí odkaz:
https://doaj.org/article/7ee447bf26584e1eb9cc73f43d985f4e
Autor:
Martin Hempel, Benjamin Röben, Michael Niehle, Lutz Schrottke, Achim Trampert, Holger T. Grahn
Publikováno v:
AIP Advances, Vol 7, Iss 5, Pp 059903-059903-1 (2017)
Externí odkaz:
https://doaj.org/article/e8ff151f1589428c94c7df2ee9dc3139
Autor:
Oliver Brandt, Vladimir M. Kaganer, Jonas Lähnemann, Timur Flissikowski, Carsten Pfüller, Karl K. Sabelfeld, Anastasya E. Kireeva, Caroline Chèze, Raffaella Calarco, Holger T. Grahn, Uwe Jahn
Publikováno v:
Physical Review Applied. 17
Autor:
Lara Torralbo-Campo, Eric Dorsch, Felix Battran, Xiang Lue, Holger T. Grahn, Dieter Koelle, Reinhold Kleiner, Jozsef Fortágh
Publikováno v:
Optical Sensors and Sensing Congress 2022 (AIS, LACSEA, Sensors, ES).
We report the ongoing development of a Rydberg atom-based detector for sensing terahertz radiation. It will be used to characterize the emission properties of a superconducting terahertz emitter and a terahertz quantum-cascade laser.
Autor:
Lutz Schrottke, Heinz-Wilhelm Hübers, Xiang Lü, Martin Wienold, Holger T. Grahn, Heiko Richter
Publikováno v:
Photoniques. :27-32
Terahertz (THz) quantum-cascade lasers (QCLs) provide powerful, narrow-band, and frequencytunable radiation, which makes them ideal sources for high-resolution molecular spectroscopy. A first application of a THz QCL has been as local oscillator in a
Autor:
Xiang Lü, Martin Wienold, Till Hagelschuer, Heinz-Wilhelm Hübers, Holger T. Grahn, Lutz Schrottke, Klaus Biermann, Heiko Richter, Benjamin Röben
Publikováno v:
IEEE Transactions on Terahertz Science and Technology. 9:606-612
We report on a compact terahertz (THz) source based on a quantum-cascade laser (QCL). The source is intended for a local oscillator in a THz heterodyne receiver for the detection of the fine structure line of neutral atomic oxygen at 4.7448 THz. The
Autor:
Xiang Lü, Jan Stake, Peter Sobis, Vladimir Drakinskiy, Lutz Schrottke, Heiko Richter, Nick Rothbart, Divya Jayasankar, Martin Wienold, Holger T. Grahn, Heinz-Wilhelm Hübers
Efficient and compact frequency converters are essential for frequency stabilization of terahertz sources. In this paper, we present a 3.5-THz, x6-harmonic, integrated Schottky diode mixer operating at room temperature. The designed frequency convert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba0a8eaddd447eccc7ed50938bb2057f
https://doi.org/10.36227/techrxiv.14847573.v2
https://doi.org/10.36227/techrxiv.14847573.v2
Autor:
Heiko Richter, Nick Rothbart, Xiang Lü, Divya Jayasankar, Holger T. Grahn, Martin Wienold, Heinz-Wilhelm Hübers, Jan Stake, Lutz Schrottke, Peter Sobis, Vladimir Drakinskiy
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
High frequency accuracy and stability are important requirements for local oscillators in terahertz heterodyne spectrometers. We report on a phase-locked loop for quantum-cascade lasers (QCLs) operating at 3.5 and 4.7 THz, two very important frequenc
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
We report on stabilizing a THz quantum-cascade laser to a molecular transition in a Doppler-free configuration. We locked the frequency to the Lamb dip of the transition, which is one order of magnitude narrower than the unsaturated absorption line.
Autor:
Achim Trampert, Ryan B. Lewis, Holger T. Grahn, Pierre Corfdir, Timur Flissikowski, Michael Niehle, Oliver Brandt, Lutz Geelhaar, Hanno Küpers
Core-shell nanowire heterostructures form the basis for many innovative devices. When compound nanowire shells are grown by directional deposition techniques, the azimuthal position of the sources for the different constituents in the growth reactor,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de4b22befe0cb0d27481fbc5d2948bb5
http://arxiv.org/abs/2106.12309
http://arxiv.org/abs/2106.12309