R
R. Kohler
Researcher at Nest Labs
Publications - 34
Citations - 6060
R. Kohler is an academic researcher from Nest Labs. The author has contributed to research in topics: Laser & Terahertz radiation. The author has an hindex of 18, co-authored 34 publications receiving 5862 citations. Previous affiliations of R. Kohler include Rice University.
Papers
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Journal ArticleDOI
Terahertz semiconductor-heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: A monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is reported, which is very promising for extending the present laser concept to continuous-wave and high-temperature operation, which would lead to implementation in practical photonic systems.
Terahertz semiconductor heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: In this article, a monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is presented.
Journal ArticleDOI
Microcavity polariton splitting of intersubband transitions.
TL;DR: The experimental findings are in good agreement with theoretical calculations performed in a transfer-matrix formalism, and a clear splitting of about 14 meV of the coupled intersubband cavity modes is observed from 10 K to room temperature, with resulting polaritonlike dispersion.
Proceedings ArticleDOI
Terahertz semiconductor-heterostructure lasers
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,A. G. Davies,David A. Ritchie,R.C. Iotti,F. Rossi +8 more
TL;DR: In this paper, an injection laser based on interminiband transitions in GaAs/AlGaAs heterostructures is operated in the THz range, achieving singlemode emission at 4.4THz, with output powers of 2.5mW and thresholds of few hundred A/cm/sup 2/ up to 50K.
Journal ArticleDOI
Terahertz quantum cascade laser as local oscillator in a heterodyne receiver
Heinz-Wilhelm Hübers,S.G. Pavlov,A. D. Semenov,R. Kohler,Lukas Mahler,Alessandro Tredicucci,Harvey E. Beere,David A. Ritchie,Edmund H. Linfield +8 more
TL;DR: Noise temperature measurements with the hot electron bolometer and a 2.5 THz quantum cascade laser yielded the same result as with a gas laser as local oscillator.