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Single mode terahertz quantum cascade amplifier

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Article number141102
<mark>Journal publication date</mark>10/2014
<mark>Journal</mark>Applied Physics Letters
Issue number14
Number of pages4
Publication StatusPublished
Early online date6/10/14
<mark>Original language</mark>English


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.