David A. Ritchie | Researchain

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Featured researches published by David A. Ritchie.

conference on lasers and electro optics | 2002

Terahertz semiconductor-heterostructure lasers

R. Kohler; Alessandro Tredicucci; Fabio Beltram; H.E. Beere; E. H. Linfield; A.G. Davies; David A. Ritchie; R.C. Iotti; Fausto Rossi

Injection lasers based on interminiband transitions in GaAs/AlGaAs heterostructures are operated in the THz range. Single-mode emission is achieved at 4.4THz, with output powers of 2.5mW and thresholds of few hundred A/cm/sup 2/ up to 50K.

Optical Terahertz Science and Technology (2007), paper WB4 | 2007

An External Cavity 4.7 Terahertz Quantum Cascade Laser

Joel M. Hensley; David B. Fenner; Mark G. Allen; Ji-Hua Xu; Richard P. Green; Lukas Mahler; Alessandro Tredicucci; Fabio Beltram; H. E. Beere; David A. Ritchie

An anti-reflection coated 4.7 terahertz quantum cascade laser coupled to an external cavity formed by a single moving mirror frequency tunes up to 4 wavenumbers with mode hops and around 0.4 wavenumbers without mode hops.

Nature Photonics | 2009

Vertically emitting microdisk lasers

Lukas Mahler; Alessandro Tredicucci; Fabio Beltram; Christoph Walther; Jérôme Faist; Bernd Witzigmann; Harvey E. Beere; David A. Ritchie

Electronics Letters | 2003

Quantum cascade lasers emitting at lambda greater than 100 /spl mu/m

R. Kohler; Alessandro Tredicucci; Fabio Beltram; H.E. Beere; E. H. Linfield; David A. Ritchie; A.G. Davies

Archive | 2008

Frequency tunability and mode switching of quantum cascade lasers operating at 2.5 THz

S.G. Pavlov; Heinz-Wilhelm Hübers; Heiko Richter; Alexey Semenov; Alessandro Tredicucci; Richard P. Green; Lukas Mahler; H. E. Beere; David A. Ritchie

Archive | 2007

Scanned-gate and Kelvin-probe microscopy to investigate surface-acoustic-wave-driven transport through a depleted GaAs channel

R. Crook; Robert Schneble; H. E. Beere; David A. Ritchie; David F. Anderson; G. A. C. Jones; Charles G. Smith; C. J. B. Ford; C. H. W. Barnes

Archive | 2006

LASERS, OPTICS, AND OPTOELECTRONICS 141101 Efficient pure-white organic light-emitting diodes with a solution-processed, binary-host employing single emission layer

Jwo-Huei Jou; Ming-Chen Sun; Hung-Hsing Chou; Chien-Hung Li; Giacomo Scalari; Christoph Walther; Jrme Faist; H. E. Beere; David A. Ritchie; Dru Morrish; Xiaosong S. Gan; Min Gu; Pavel Murzyn; A. Z. Garcia-Deniz; Dmytro Kundys; A. Mark Fox; David M. Whittaker; M. S. Skolnick; Thomas F. Krauss; John S. Roberts; Hai-Pang Chiang; Jing-Lun Lin; Zhi-Wei Chen; Anthony Garzarella; Syed B. Qadri; Terence J. Wieting; Dong Ho Wu; Alessandro Ustione; A. Cricenti; F. Bonfigli

Archive | 2006

Phase matched frequency mixing between telecom wavelengths and THz radiation in a quantum cascade laser

Sukhdeep Dhillon; C. Sirtori; Jesse Alton; S. Barbieri; A. De Rossi. M. Calligaro; H. E. Beere; David A. Ritchie

Archive | 2006

Spectral characterization of a 2.5 THz multi-mode quantum cascade laser

S.G. Pavlov; Heinz-Wilhelm Hübers; Heiko Richter; Alexei D. Semenov; Alessandro Tredicucci; Rüdeger Köhler; Lukas Mahler; H. E. Beere; David A. Ritchie

Archive | 2006

2.8 THz heterodyne receiver based on a surface plasmon quantum cascade laser and a hot electron bolometer mixer

Merlijn Hajenius; R. Khosropanah; J. Niels Hovenier; Jian Gao; Teun M. Klapwijk; Sukhdeep Dhillon; S. Barbieri; Pascal Filloux; C. Sirtori; David A. Ritchie; H. E. Beere

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