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Proceedings Paper

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 have been realized with small VCSEL chips. The optical emission pattern of VCSELs can be tailored to the desired field of view using beam shaping elements. Such optical elements also enable laser safe class 1 products. A detailed analysis of the complete system and the operation mode is required to calculate the maximum permitted power for a safe system. 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: 19 February 2018
PDF: 7 pages
Proc. SPIE 10552, Vertical-Cavity Surface-Emitting Lasers XXII, 105520G (19 February 2018); doi: 10.1117/12.2288172
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. 10552:
Vertical-Cavity Surface-Emitting Lasers XXII
Chun Lei; Kent D. Choquette, Editor(s)

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