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Dean P, Keeley J, Valavanis A, et al. Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser. Opt Lett. 2015;40(6):950-3doi: 10.1364/OL.40.000950.
Dean, P., Keeley, J., Valavanis, A., Bertling, K., Lim, Y. L., Taimre, T., Alhathlool, R., Li, L. H., Indjin, D., Rakić, A. D., Linfield, E. H., & Davies, A. G. (2015). Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser. Optics letters, 40(6), 950-3. https://doi.org/10.1364/OL.40.000950
Dean, P, et al. "Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser." Optics letters vol. 40,6 (2015): 950-3. doi: https://doi.org/10.1364/OL.40.000950
Dean P, Keeley J, Valavanis A, Bertling K, Lim YL, Taimre T, Alhathlool R, Li LH, Indjin D, Rakić AD, Linfield EH, Davies AG. Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser. Opt Lett. 2015 Mar 15;40(6):950-3. doi: 10.1364/OL.40.000950. PMID: 25768154.
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Opt Lett. 2015 Mar 15;40(6):950-3. doi: 10.1364/OL.40.000950.

Active phase-nulling of the self-mixing phase in a terahertz frequency quantum cascade laser.

Optics letters

P Dean, J Keeley, A Valavanis, K Bertling, Y L Lim, T Taimre, R Alhathlool, L H Li, D Indjin, A D Rakić, E H Linfield, A G Davies

PMID: 25768154 DOI: 10.1364/OL.40.000950

Abstract

We demonstrate an active phase-nulling scheme for terahertz (THz) frequency quantum cascade lasers (QCLs) under optical feedback, by active electronic feedback control of the emission frequency. Using this scheme, the frequency tuning rate of a THz QCL is characterized, with significantly reduced experimental complexity compared to alternative approaches. Furthermore, we demonstrate real-time displacement sensing of targets, overcoming the resolution limits imposed by quantization in previously implemented fringe-counting methods. Our approach is readily applicable to high-frequency vibrometry and surface profiling of targets, as well as frequency-stabilization schemes for THz QCLs.

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