Results 221 to 230 of about 36,061 (262)

Terahertz heterostructure lasers

The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003
Quantum cascade lasers in GaAs/AlGaAs heterostructures are operated in the THz range, with peak powers of several mWs and thresholds of few hundred A/cm/sup 2/ up to 60 K. Single-mode and continuous-wave emission are also achieved at 4.4 THz.
A. Tredicucci, R. Kohler, F. Beltram, H.E. Beere, E.H. Linfield, A.G. Davies, D.A. Ritchie, R.C. Iotti, F. Rossi   +8 more
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Terahertz Gas Laser

2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006
CS2 laser with optical pumping has been offered for obtaining powerful T-rays. As a pumping source CO2 laser oscillating on the hot band (wavelength 11.4 mum) has been used. Calculations have shown that at the optimal conditions the output 0.1 J at the peak power 1 MW can be obtained.
V.A. Gorobets, B.F. Kuntsevich, V.O. Petukhov   +2 more
openaire   +1 more source

Bistability in bosonic terahertz lasers

Journal of Physics: Condensed Matter, 2014
We study theoretically terahertz (THz) lasing in a system consisting of a quantum well placed inside an optical microcavity and a THz cavity in the regime of two-photon excitation of 2p dark exciton states. The stability of the system with varying parameters of the microcavity under coherent pumping is analyzed.
A A Pervishko, T C H Liew, A V Kavokin, I A Shelykh   +3 more
openaire   +2 more sources

Terahertz Silicon Lasers

2003
Terahertz silicon lasers are based on intracenter transitions of group-V donors. The peculiarities due to electron-phonon interaction and the state-of-the-art performance such as frequency tunability by stress or magnetic field are discussed.
S. G. Pavlov, H.-W. Hübers, M. H. Rümmeli, J. N. Hovenier, T. O. Klaassen, R. Kh. Zhukavin, A. V. Muravjov, V. N. Shastin   +7 more
openaire   +1 more source

Laser terahertz emission microscope

SPIE Proceedings, 2011
Recent progress of laser terahertz (THz) emission microscope (LTEM) is reviewed.Femtosecond lasers can excite the THz waves in various electronic materials due to ultrafast current modulation. The current modulation is realized by acceleration or deceleration of photo-excited carriers, and thus LTEM visualizes dynamic photo-response of substances ...
Masayoshi Tonouchi, Sunmi Kim, Iwao Kawayama, Hironaru Murakami   +3 more
openaire   +1 more source

Silicon Stokes terahertz laser

AIP Conference Proceedings, 2007
A Raman‐type silicon laser at terahertz frequencies has been realized. Stokes‐shifted stimulated emission has been observed from silicon crystals doped by antimony donors when optically excited by an infrared free electron laser. The Raman lasing was obtained due to resonant scattering on electronic states of a donor atom.
Pavlov, Sergey, Hübers, Heinz-Wilhelm, Hovenier, Jacob Niels, Klaassen, Tjeerd Onno, Carder, Damian A., Phillips, P. Jonathan, Redlich, Britta, Riemann, Helge, Zhukavin, Roman, Shastin, Valery   +9 more
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Terahertz Semiconductor Laser Structures

Materials Science Forum, 2002
In this paper, we theoretically examine the possible quantum well structures that may fulfill the criterion to achieve a terahertz (THz) laser devices.
Qing Xiang Zhao, Magnus Willander
openaire   +1 more source

Laser Terahertz Emission Microscope

Proceedings of the IEEE, 2007
Developments of laser terahertz (THz) emission microscope (LTEM) systems are reviewed. Femtosecond lasers can excite the THz wave emission from various electronic materials, such as semiconductors, high-temperature superconductors, manganites, multiferroic oxides, etc., due to ultrafast current modulation.
Hironaru Murakami, Naotsugu Uchida, Ryotaro Inoue, Sunmi Kim, Toshihiko Kiwa, Masayoshi Tonouchi   +5 more
openaire   +1 more source

Laser Terahertz Emission Nanoscopy

CLEO Pacific Rim Conference, 2018
We demonstrate depletion of terahertz emission from semiconductors by applying a DC bias between a substrate and an AFM probe operating in tapping mode. The depletion is strongly dependent on the probe tapping amplitude.
Angela Pizzuto, Pernille Klarskov, Daniel M. Mittleman   +2 more
openaire   +1 more source

Terahertz laser frequency combs

Nature Photonics, 2014
Frequency combs based on terahertz quantum cascade lasers, which combine the high power of lasers with the broadband capabilities of pulsed sources, are demonstrated. The frequency combs generate 5 mW of terahertz power covering a frequency range of almost 500 GHz and produce more than 70 lines at 3.5 THz.
David Burghoff, Tsung-Yu Kao, Ningren Han, Chun Wang Ivan Chan, Xiaowei Cai, Yang Yang, Darren J. Hayton, Jian-Rong Gao, John L. Reno, Qing Hu   +9 more
openaire   +1 more source