Single mode terahertz quantum cascade amplifier

Ren, Y. and Wallis, R. and Shah, Y. D. and Jessop, D. S. and Degl'Innocenti, Riccardo and Klimont, A. and Kamboj, V. and Beere, H. E. and Ritchie, D. A. (2014) Single mode terahertz quantum cascade amplifier. Applied Physics Letters, 105 (14). ISSN 0003-6951

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Abstract

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:
Journal Article
Journal or Publication Title:
Applied Physics Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3101
Subjects:
ID Code:
89610
Deposited By:
Deposited On:
10 Jan 2018 13:58
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Nov 2020 05:51