A solid-state block-based pulsed laser illuminator for SPAD-based time-of-flight 3-D range imaging

Sahba Jahromi, J-P Jansson, P. P. Keränen, Evgeny Avrutin, B.S. Ryvkin, Juha Tapio Kostamovaara

Research output: Contribution to journalArticlepeer-review


A laser diode illuminator for single photon detection (SPAD) based pulsed time-of-flight 3-D range imaging is presented. The illuminator supports the block-based illumination scheme. It consists of a 16-element custom designed common anode quantum-well (QW) laser diode bar working in the enhanced gain switching regime and lasing at ~810nm. The laser diode elements are separately addressable and driven with GaN drivers producing 5...10A/~2ns current pulses from a supply voltage of 90V. Cylindrical optics is used to produce a total illumination field-of-view of 40ºx10º (FWHM) in 16 separately addressable blocks. With a laser pulsing frequency of 256kHz and laser pulse energy of ~8.5nJ, the average optical illumination power of the transmitter is 2.2mW
Original languageEnglish
Article number054105
Number of pages11
Issue number5
Publication statusPublished - 21 May 2021

Bibliographical note

© The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.


  • Laser radar
  • single photon detection
  • range imaging
  • lidar

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