8 May 2008 Compact illumination modules based on high-power VCSEL arrays
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Abstract
Multi-mode VCSEL arrays are candidates for compact illumination modules with applications as flash light illumination for the detailed imaging of fast moving objects (> 100 m/s) or for time-of-flight cameras with modulation frequency in the > 10 MHz domain. Rise and fall times have to be as short as a few nanoseconds, while the optical output power has to be in the order of one Watt. In this paper we investigate, for multi-mode VCSEL arrays, the dependency of the far-field pattern on the drive current and on the distance to a reflecting surface. We demonstrate that, with the help of diffusing elements, the current dependency of the far-field pattern can be reduced. We have realized an illumination unit with modulation frequencies of up to 80 MHz and an optical output of 1 Watt.
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Christiane Gimkiewicz, Christiane Gimkiewicz, Michael Columbus, Michael Columbus, Michael Moser, Michael Moser, "Compact illumination modules based on high-power VCSEL arrays", Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 69971I (8 May 2008); doi: 10.1117/12.780231; https://doi.org/10.1117/12.780231
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