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25 February 2017 VCSELs as light source for time-of-flight sensors
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VCSELs and VCSEL arrays are an ideal light source for time-of-flight based sensors. The narrow emission spectrum and the ability for short pulses make them superior to LEDs. Combined with fast photodiodes or special camera chips spatial 3D information can be obtained which is needed in diverse applications like camera autofocus, indoor navigation, 3Dobject recognition or even autonomously driving vehicles. VCSEL arrays are the way to tailor the output power. For pulse operation at low duty cycle average heat dissipation is no longer the upper limit to the operating point of VCSELs but over-pulsing becomes possible. Taking into account electrical boundary conditions and optimum conversion efficiency arrays can be designed for specific operating conditions. Measurements of arrays under short pulse operation are presented using a package with integrated driver.
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Holger Moench, Manuel Frey, Martin Grabherr, Stephan Gronenborn, Ralph Gudde, Johanna Kolb, Michael Miller, and Alexander Weigl "VCSELs as light source for time-of-flight sensors", Proc. SPIE 10122, Vertical-Cavity Surface-Emitting Lasers XXI, 1012204 (25 February 2017);

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