Zobrazeno 1 - 10
of 86
pro vyhledávání: '"Ch. Mann"'
Autor:
S. G. Bochvar, I. V. Bobkov, A. Yu. Krokhin, A. V. Danilov, I. V. Kostin, M. M. Motkov, V. F. Frolov, A. Yu. Sidorov, V. Ch. Mann
Publikováno v:
The Minerals, Metals & Materials Series ISBN: 9783319722832
The paper presents the possibility of ultrasonic treatment to refine large slabs of 5052 aluminum alloy in direct chill casting. Combined modification with grain refiner rod AlTi5%B1% and exposure of the melt flow to a powerful cavitation effect has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c6c9c2200d45c4890b0431baf911def
https://doi.org/10.1007/978-3-319-72284-9_117
https://doi.org/10.1007/978-3-319-72284-9_117
Publikováno v:
IEEE Journal of Quantum Electronics. 42:994-1000
The influence of injector doping concentration Ninj on the performance of InP-based quantum-cascade (QC) lasers is investigated for devices emitting around 9.2-mum wavelength and injector doping concentrations between 1times1017 cm-3 and 3times1017 c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac9c83b8f02ba1404088086db8f9f26b
https://doi.org/10.1109/jqe.2006.881411
https://doi.org/10.1109/jqe.2006.881411
Publikováno v:
Journal of Crystal Growth. 278:714-717
Conventional strain-compensated quantum cascade (QC) lasers are fabricated with both tensile strained AlInAs and compressively strained GaInAs layers. We show that strain compensation can also be achieved using tensile strained AlInAs barrier layers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96376397e24698eb6a1668b5c80658b9
https://doi.org/10.1016/j.jcrysgro.2005.01.001
https://doi.org/10.1016/j.jcrysgro.2005.01.001
Publikováno v:
physica status solidi (a). 190:861-866
The radiative coupling between heavy-hole excitons in ZnSe double quantum wells is investigated experimentally and theoretically. The double quantum wells have a distance of half or quarter the wavelength (λ/2, λ/4) of the light resonant to the exc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dae373b3a46961c41c21eb5b33338223
https://doi.org/10.1002/1521-396x(200204)190:3<861::aid-pssa861>3.0.co
https://doi.org/10.1002/1521-396x(200204)190:3<861::aid-pssa861>3.0.co
Publikováno v:
physica status solidi (b). 221:467-472
Using a Four-Wave-Mixing (FWM) experiment in backward-scattering geometry the coherent dynamics of the quadrupole polarization associated with excitonic molecules is studied in bulk CdSe. By analyzing the FWM signal at negative delay times and exploi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::655ed4179edbeb35b8c520102c877f7e
https://doi.org/10.1002/1521-3951(200009)221:1<467::aid-pssb467>3.0.co
https://doi.org/10.1002/1521-3951(200009)221:1<467::aid-pssb467>3.0.co
Autor:
Joachim Wagner, Klaus Köhler, Harald Schneider, Quankui Yang, Frank Fuchs, N. Rollbühler, Ch. Mann, Rudolf Kiefer
Publikováno v:
Applied Physics Letters. 80:2048-2050
We report the improvement of quantum cascade lasers emitting at λ∼5 μm by introducing AlAs blocking barriers together with strain-compensating InAs layers into the active regions. The blocking barriers are designed to selectively prevent electron
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::56e825c158c4229d17b72b7649950e75
https://doi.org/10.1063/1.1462866
https://doi.org/10.1063/1.1462866
Autor:
Ch. Mann, Marcel Rattunde, J. Wagner, K. Köhler, Quankui Yang, E. Romasev, W. Bronner, C. Manz, B. Rosener, F. Fuchs, N. Schulz, M. Raab, Hans Dieter Tholl
Publikováno v:
SPIE Proceedings.
We report on the development and characteristics of infrared semiconductor lasers as compact and robust light sources for Directed Infrared Countermeasures (DIRCM). The short-wavelength side of the 2-5 μm wavelength band of interest can be covered b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e58d8a2493d79dca8f83ef1c13d60b50
https://doi.org/10.1117/12.800126
https://doi.org/10.1117/12.800126
Publikováno v:
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference.
The linewidth enhancement factor (or alpha parameter) describes the coupling of amplitude and phase in a semiconductor laser. In quantum cascade lasers, the self-mixing effect necessary for single mode operation, is usually realized by using a distri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8cba0e31ae8d3d896b88f9f9b3d29867
https://doi.org/10.1109/cleoe-iqec.2007.4385946
https://doi.org/10.1109/cleoe-iqec.2007.4385946
Autor:
Klaus Köhler, B. Kirn, B. Raynor, Joachim Wagner, Wolfgang Bronner, Ch. Mann, Frank Fuchs, Quankui Yang
Publikováno v:
SPIE Proceedings.
We present a study of the spectral characteristics of Fabry-Perot quantum cascade lasers in pulsed mode operation applying a time resolution of 3 ns in combination with a high spectral resolution of 0.02 cm-1. With this technique the laser spectra we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82402d52c9af12197053f2ab5a5f4b38
https://doi.org/10.1117/12.685379
https://doi.org/10.1117/12.685379
Bound-to-contiuum GaInAs-AlAsSb quantum cascade lasers with reduced electric injection power density
Autor:
K. Schwarz, Ch. Mann, Joachim Wagner, Quankui Yang, K. Schauble, Wolfgang Bronner, Klaus Köhler, Christian Manz
Short-wavelength (lambda < 4 µm) GaInAs-AlAsSb quantum cascade (QC) lasers have been demonstrated using a "bound-to-continuum" design for the purpose of reducing the electric injection power density. As a result, we have reduced the low-temperature
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35989f699ac21c4ffd78c93aca613aa3
https://publica.fraunhofer.de/handle/publica/210296
https://publica.fraunhofer.de/handle/publica/210296