Optical feedback effects on terahertz quantum cascade lasers: Modelling and applications

Aleksandar D. Rakić, Yah Leng Lim, Thomas Taimre, Gary Agnew, Xiaoqiong Qi, Karl Bertling, She Han, Stephen J. Wilson, Iman Kundu, Andrew Grier, Zoran Ikonić, Alexander Valavanis, Aleksandar Demić, James Keeley, Lianhe H. Li, Edmund H. Linfield, A. Giles Davies, Paul Harrison, Blake Ferguson, Graeme WalkerTarl Prow, Dragan Indjin, H. Peter Soyer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)


Terahertz (THz) quantum cascade lasers (QCLs) are compact sources of radiation in the 1-5 THz range with significant potential for applications in sensing and imaging. Laser feedback interferometry (LFI) with THz QCLs is a technique utilizing the sensitivity of the QCL to the radiation reflected back into the laser cavity from an external target. We will discuss modelling techniques and explore the applications of LFI in biological tissue imaging and will show that the confocal nature of the QCL in LFI systems, with their innate capacity for depth sectioning, makes them suitable for skin diagnostics with the well-known advantages of more conventional confocal microscopes. A demonstration of discrimination of neoplasia from healthy tissue using a THz, LFI-based system in the context of melanoma is presented using a transgenic mouse model.

Original languageEnglish
Title of host publicationInfrared, Millimeter-Wave, and Terahertz Technologies IV
EditorsCunlin Zhang, Xi-Cheng Zhang, Masahiko Tani
Number of pages12
ISBN (Electronic)9781510604803
ISBN (Print)9781510604797
Publication statusPublished - 8 Dec 2016
Externally publishedYes
EventInfrared, Millimeter-Wave, and Terahertz Technologies IV - Beijing, China
Duration: 12 Oct 201614 Oct 2016
Conference number: 4

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceInfrared, Millimeter-Wave, and Terahertz Technologies IV


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