Single mode terahertz quantum cascade amplifier

Ren, Y., Wallis, R., Shah, Y.D. , Jessop, D.S., Degl'Innocenti, R., Klimont, A., Kamboj, V., Beere, H.E. and Ritchie, D.A. (2014) Single mode terahertz quantum cascade amplifier. Applied Physics Letters, 105(14), 141102. (doi: 10.1063/1.4897438)

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A terahertz (THz) optical amplifier based on a 2.9 THz quantum cascade laser (QCL) structure has been demonstrated. By depositing an antireflective coating on the QCL facet, the laser mirror losses are enhanced to fully suppress the lasing action, creating a THz quantum cascade (QC) amplifier. Terahertz radiation amplification has been obtained, by coupling a separate multi-mode THz QCL of the same active region design to the QC amplifier. A bare cavity gain is achieved and shows excellent agreement with the lasing spectrum from the original QCL without the antireflective coating. Furthermore, a maximum optical gain of ∼30 dB with single-mode radiation output is demonstrated.

Item Type:Articles
Additional Information:This work was supported by the Engineering and Physical Sciences Research Council.
Glasgow Author(s) Enlighten ID:Shah, Dr Yash Diptesh
Authors: Ren, Y., Wallis, R., Shah, Y.D., Jessop, D.S., Degl'Innocenti, R., Klimont, A., Kamboj, V., Beere, H.E., and Ritchie, D.A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:American Institute of Physics
ISSN (Online):1077-3118
Published Online:06 October 2014
Copyright Holders:Copyright © 2014 AIP Publishing LLC
First Published:First published in Applied Physics Letters 105:141102
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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