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Simple electrical modulation scheme for laser feedback imaging

Research output: Contribution to journalArticlepeer-review


K. Bertling, T. Taimre, G. Agnew, Y. Lim, P. Dean, D. Indjin, Sven Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, A. Rakic

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In this work, we demonstrate a simple square-wave electrical modulation scheme for imaging with laser feedback interferometry (LFI). Distinct advantages of this scheme include (a) the straightforward creation of the modulating signal, even for high-current lasers, and (b) its natural suitability for lock-in detection. We compare this simple scheme against two established imaging modalities for LFI: mechanical modulation using an optical chopper and the swept-frequency feedback interferometry approach. The proposed scheme lends itself to high frequency modulation which paves the way for high frame-rate LFI imaging with no motion artefacts using off-the-shelf equipment.


Original languageEnglish
JournalIEEE Sensors Journal
Issue number7
Early online date9 Dec 2015
Publication statusPublished - 1 Apr 2016

    Research areas

  • Choppers (circuits), Frequency modulation, Imaging, Optical feedback, Optical modulation, Optical sensors

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