Keeley, J orcid.org/0000-0001-5251-6648, Freeman, J orcid.org/0000-0002-5493-6352, Valavanis, A et al. (10 more authors) (2016) Self-Mixing as a means of Spectral Characterisation of a Terahertz QCL. In: UK Semiconductors 2016, 06-07 Jul 2016, Sheffield, UK.
Abstract
Fast, sensitive and compact coherent systems for imaging and interferometry can be developed through the use of a single terahertz (THz) quantum cascade laser (QCL) device as both emitter and detector in a self-mixing (SM) scheme [1]. Here, radiation re-injected to the laser cavity interferes (‘mixes’) with the intra-cavity electric field, causing small variations in the fundamental laser parameters [2]. Of particular importance is the voltage perturbation induced by optical feedback. This can be used as a method of measuring the self-mixing effect through monitoring the terminal voltage of the device, and is dependent on the external cavity length and lasing frequency. As such, interferometric fringes can be acquired in a SM system by simply changing the external cavity length. In this work we demonstrate the use of SM interferometry for performing spectral characterisation of a multi-mode THz QCL in a scheme that offers much reduced experimental complexity, compared with typical Fourier Transform infrared spectroscopy (FTIR) systems.
Metadata
Item Type: | Conference or Workshop Item |
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Authors/Creators: |
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Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/J002356/1 Royal Society WM110032 EPSRC EP/J017671/1 Royal Society WM150029 |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Sep 2016 13:11 |
Last Modified: | 04 Feb 2018 11:07 |
Status: | Published |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104670 |