Results 21 to 30 of about 1,207,154 (235)

High-Frequency Modulation Spectroscopy with a THz Quantum-Cascade Laser [PDF]

, 2013
A terahertz absorption spectrometer with a quantum-cascade laser (QCL) for high-resolution molecular spectroscopy is realized. The spectrometer is based on highfrequency (up to 50 MHz) modulation of the QCL frequency.
H.-W. Hubers, H. Richter, Richter, Heiko, Schrottke, Lutz, Grahn, H. T., Eichholz, Rene, Hübers, Heinz-Wilhelm, Wienold, Martin, R. Eichholz, M. Wienold, L. Schrottke, H. T. Grahn   +11 more
core   +1 more source

Phase-matching in terahertz quantum cascade laser sources based on Cherenkov difference-frequency mixing

APL Photonics, 2023
Terahertz quantum cascade laser sources based on intra-cavity Cherenkov difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers are currently the only monolithic semiconductor laser technology that can deliver continuous ...
Wolfhard Oberhausen, Iaroslav Lubianskii, Gerhard Boehm, Axel Strömberg, Balaji Manavaimaran, Dominik Burghart, Yan-Ting Sun, Mikhail A. Belkin   +7 more
doaj   +1 more source

Molecular spectroscopy with a multimode THz quantum-cascade laser [PDF]

, 2011
A terahertz absorption spectrometer for highresolution molecular spectroscopy is realized. The spectrometer is based on a multimode quantum-cascade laser. The design and performance of the spectrometer are presented.
A. D. Semenov, H.-W. Hubers, H. Richter, Eichholz, Rene, M. Giehler, Schrottke, L., Pavlov, Sergey, S. G. Pavlov, Wienold, M., Semenov, A. D., Richter, Heiko, Grahn, H. T., Giehler, M., Hübers, Heinz-Wilhelm, R. Eichholz, Hey, R., M. Wienold, L. Schrottke, H. T. Grahn, R. Hey   +19 more
core   +1 more source

Enhancement of Terahertz radiation due to excitation of SPW on graphene strip coated on GaAs structure

Results in Optics, 2023
The present study proposes a methodology for improving terahertz (THz) radiation through the utilisation of a laser directed towards a graphene strip that has been coated onto a GaAs structure.
Sandeep, Hitendra K. Malik
doaj   +1 more source

Dynamic modeling of Terahertz Quantum cascade lasers [PDF]

, 2011
In this paper, the influence of the simplifications made in the four-equation-based set of rate equations describing the dynamic behavior of a Quantum Cascade Laser (QCL) is studied.
Petitjean, Yoann, Destic, Fabien, Mollier, Jean-Claude, Sirtori, Carlo   +3 more
core   +1 more source

Measured and simulated performance of a ceramic micromechanical beam steering device at 94 GHz [PDF]

, 2008
We report the first experimental demonstration of a transmission-mode micromechanical beam steering device for use in standoff terahertz imaging and spectroscopy.
Drysdale, T.D., Walsby, E.D., Drysdale, T. D., Walsby, E. D., Cumming, D.R.S., Cumming, D. R. S.   +5 more
core   +1 more source

Pepper-pot emittance measurement of laser-plasma wakefield accelerated electrons [PDF]

, 2009
The transverse emittance is an important parameter governing the brightness of an electron beam. Here we present the first pepper-pot measurement of the transverse emittance for a mono-energetic electron beam from a laser-plasma wakefield accelerator ...
Shanks, R. P., Welsh, G. H., Cipiccia, S., Anania, M. P., Vieux, G., Gallacher, J. G., Islam, M. R., Ersfeld, B., Issac, R. C., Wiggins, S. M., Jaroszynski, D. A., Brunetti, E.   +11 more
core   +4 more sources

Spatial-energy characteristics of focused modes of a metal terahertz laser resonator [PDF]

Радиофизика и электроника, 2019
Subject and ppurpose. In this paper, the spatial-energy characteristics of laser beams with inhomogeneous spatial polarization with their moderate and sharp focusing are theoretically investigated.
S.A. Vlasenko, A.V. Degtyarev, M.M. Dubinin, V.A. Maslov   +3 more
doaj   +1 more source

Possible explanations for different surface quality in laser cutting with 1 micron and 10 microns beams [PDF]

, 2012
In laser　cutting　of　thick　steel　sheets,　quality　difference　is　observed　between　cut　surfaces　obtained　with 1 micron and 10 micron laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength ...
Remy Fabbro, Koji Hirano, FABBRO, Rémy, HIRANO, Koji   +3 more
core   +1 more source

Sub-terahertz and terahertz generation in long-wavelength quantum cascade lasers

Nanophotonics, 2019
Terahertz quantum cascade laser sources with intra-cavity non-linear frequency mixing are the first room-temperature electrically pumped monolithic semiconductor sources that operate in the 1.2–5.9 THz spectral range.
Fujita Kazuue, Hayashi Shohei, Ito Akio, Hitaka Masahiro, Dougakiuchi Tatsuo   +4 more
doaj   +1 more source