Single mode terahertz quantum cascade amplifier
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge (United Kingdom)
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.
- OSTI ID:
- 22350839
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 105; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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