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#INSPIRIT DIFFUSER HOW TO#

The scattered light distribution can be controlled by using a suitable design of the holographic pattern.įor example, one can achieve a given angular distribution of transmitted light while largely avoiding any back-reflection. Such devices often function as holographic diffusers, where each light beam obtains a (quasi-)random phase change, but does not undergo multiple random scattering processes.

There are also transmissive or reflective micro-optical diffusers, containing a pseudo-random structure, where each part of an incident beam experiences a quasi-random change of optical phase.

Holographic diffusers can have particularly well controlled scattering properties.

In some cases, one uses glass or plastic optics with structured surfaces, such that one obtains refraction as on small prisms.

Alternatively, one can transmit light through a piece of ground, sandblast or chemically etched glass (also called frosted glass or milk glass) or a photopolymer, containing many scattering centers.

In simple cases, even a piece of white paper is sufficient. Some devices have a scattering medium on top of a mirror surface, e.g.

One can use diffuse scattering on white ceramics or a sandblasted (and thus microstructured) optical surface in a reflective geometry.In most, but not all cases, a diffuser works based on light scattering or refraction on or in a stationary piece of material with a highly random structure. Note that there are other kinds of diffusers outside the area of optics, which are not treated here for example, some diffusers are made to manipulate air flows. a few millimeters.Īlso, there are diffuser coatings which can be applied to various kinds of surfaces, e.g. Optical diffusers can have different geometrical shapes, adapted to different applications.įor example, there are diffuser plates, normally either with a circular or rectangular area and a small thickness of e.g. exhibiting a bell-shaped relatively narrow scattering distribution. Some of them have a light output with essentially Lambertian characteristics, while others substantially differ from that, e.g. However, the degree and detailed characteristics of diffusion can differ substantially between different devices. In other words, one obtains random or pseudo-random changes of optical phase for different parts of the special profile of incoming light.įor example, if a highly spatially coherent laser beam hits a diffuser, the light emerging from the diffuser may no longer have the characteristics of a beam, but rather propagate in a wide range of directions.

#INSPIRIT DIFFUSER HOW TO#

How to cite the article suggest additional literatureĪn optical diffuser is a device which can diffuse light, i.e., essentially means strongly scrambling its wavefronts and reducing its spatial coherence. Using our ad package, you can display your logo and further below your product description.ĭefinition: devices which scatter light such that its spatial coherence is substantially reducedĪlternative terms: optical diffusers, light diffusers