Simple electrical modulation scheme for laser feedback imaging

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

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


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


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


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