Eye-safe wide-angle diffuser targets lidar applications

February 11, 2020 //By Christoph Hammerschmidt
Eye-safe wide-angle diffuser targets lidar applications
Laser optics provider Focuslight Technologies has developed a glass refractive optical element (ROE) with the ability to disperse laser light in one direction up to a full illumination angle.

The LIMO Wide Angle Diffuser covers an extreme wide angle from a few mrad up to 150 degrees. When combined with a second functional surface, the light can also be shaped at any desired angle in the other direction. This makes it possible to obtain a rectangular field with a steep edge slope and a user-defined field of view (FOV), for example 60° x 45° or 120° x 25°. The product is designed to work with a variety of light sources, including collimated light, diverging light, or a light source array, such as VCSELs.

Unlike diffractive optical elements (DOE), which are limited to small angles, moderate ambient conditions, and have an intensity distribution that drops flat at the edges, the LIMO Wide Angle Diffuser is an eye-safe ROE with no zero-order and no "hot spot." The glass material features small refractive index variation and small thermal expansion with temperature, delivering stable performance over a wide temperature range (-40℃~150℃). High uniformity and high window efficiency within the FOV deliver a homogenous intensity profile in angular space with high-quality edges. The end result is high efficiency that allows intelligent use of every generated photon while preventing scattered radiation.


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