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

Optics Letters
P DeanAlexander Giles Davies

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.

References

May 10, 2002·Nature·Rüdeger KöhlerFausto Rossi
Mar 24, 2004·Optics Letters·A BarkanD A Ritchie
Sep 20, 2006·Applied Optics·Silvano DonatiGuido Giuliani
Dec 10, 2009·Optics Express·J M HensleyD A Ritchie
Jul 5, 2011·Optics Letters·Paul DeanA Giles Davies
Jun 6, 2013·Optics Express·F P MezzapesaG Scamarcio
Nov 27, 2014·Biomedical Optics Express·Yah Leng LimAleksandar D Rakić

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Citations

May 2, 2018·Optics Letters·Junfeng Wu, Fengfeng Shu

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