Wide-angle diffuser for safe LiDAR laser illumination

June 28, 2019 //By Julien Happich
diffuser
Thanks to its zero hot spot beam shaping, LIMO’s wide-angle laser beam diffuser delivers consistent performance, even in extreme operating temperatures, supporting an expansive illumination area.

This enables full coverage of the 360° automotive surrounding view with just four LiDAR systems for reliable driving safety. Safe and reliable operation of the LiDAR system is only possible if the risk of injury from laser photons has been eliminated - something that requires a beam propagation without any hot spots. This in turn necessitates a consistent intensity distribution of the laser radiation, even at high ambient temperatures. Up to now, the use of diffractive optical elements (DOE) has been limited to small angles and moderate ambient conditions. In addition, most of the optics used have an intensity distribution that drops flat at the edges.

The diffuser technology from LIMO takes a different approach: Similar to homogenization optics, LIMO designs glass refractive optical elements that have the ability to disperse laser light in one direction up to a full illumination angle ranging from a few mrad to over 100°. When combined with a second functional surface, the light can also be shaped at any desired angle in the other direction, making it possible to obtain a rectangular field with a steep edge slope and a user-defined size of 120°x25°, for example. These diffusers can be combined with all types of low- and high-power laser sources. The diffusers are manufactured on 300x300mm optics glass wafers

LIMO GmbH - www.limo.de


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