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VCSELs in short-pulse operation for time-of-flight applications
Author(s): Holger Moench; Stephan Gronenborn; Xi Gu; Ralph Gudde; Markus Herper; Johanna Kolb; Michael Miller; Michael Smeets; Alexander Weigl
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Paper Abstract

VCSEL arrays are the ideal light source for 3D imaging applications. The narrow emission spectrum and the ability for short pulses make them superior to LEDs. Combined with fast photodiodes or special camera chips spatial information can be obtained which is needed in diverse applications like camera autofocus, indoor navigation, 3D-object recognition, augmented reality or autonomously driving vehicles. Pulse operation at the ns scale and at low duty cycle can work with significantly higher current than traditionally used for VCSELs in continuous wave operation. With reduced thermal limitations at low average heat dissipation very high currents become feasible and tens of Watts output power could be realized with small VCSEL chips. Good reliability is demonstrated up to current densities above 100kA/cm². At higher current density and temperature gradual degradation can be observed. With this limitation in mind VCSEL arrays can be operated at 15 times higher current than in most continuous operation cases. The good VCSEL properties like robustness, stability over temperature and the potential for integrated solutions open a huge potential for VCSELs in new mass applications in the consumer and automotive markets.

Paper Details

Date Published: 1 March 2019
PDF: 7 pages
Proc. SPIE 10938, Vertical-Cavity Surface-Emitting Lasers XXIII, 109380E (1 March 2019); doi: 10.1117/12.2507452
Show Author Affiliations
Holger Moench, Philips GmbH Photonics Aachen (Germany)
Stephan Gronenborn, Philips GmbH Photonics Aachen (Germany)
Xi Gu, Philips Photonics (Netherlands)
Ralph Gudde, Philips Photonics (Netherlands)
Markus Herper, Philips GmbH Photonics Aachen (Germany)
Johanna Kolb, Philips GmbH Photonics Aachen (Germany)
Michael Miller, Philips GmbH U-L-M Photonics (Germany)
Michael Smeets, Philips GmbH U-L-M Photonics (Germany)
Alexander Weigl, Philips GmbH U-L-M Photonics (Germany)

Published in SPIE Proceedings Vol. 10938:
Vertical-Cavity Surface-Emitting Lasers XXIII
Kent D. Choquette; Luke A. Graham, Editor(s)

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