Mohandas, RA;
Ponnampalam, L;
Seeds, A;
Dean, P;
Linfield, EH;
Davies, AG;
Freeman, JR;
(2019)
High-resolution frequency and phase control of a terahertz laser.
In:
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
IEEE: Paris, France.
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Abstract
We report on the high-resolution frequency and phase control of a terahertz (THz) quantum cascade laser (QCL). The 2.0 THz QCL is locked to a stable microwave reference frequency via an all-fibre infrared frequency comb. The frequency of the QCL is controlled by optical injection and the phase is independently controlled by introducing a phase-lock loop that provides electronic feedback to the QCL, forming an optical injection phase locked loop (OIPLL). By implementing this, (1) the instrument limited linewidth of the locked QCL was $ {<; }1$ Hz (2) for a fixed frequency, the phase of the THz QCL relative to the microwave reference frequency can be controlled within a range 0.3 π.
| Type: | Proceedings paper |
|---|---|
| Title: | High-resolution frequency and phase control of a terahertz laser |
| Event: | 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/IRMMW-THz.2019.8873906 |
| Publisher version: | https://doi.org/10.1109/IRMMW-THz.2019.8873906 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10087636 |
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