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Engineered Diffusers™![]()
ED1-C20-MD ED1-C20 Line Pattern Square Pattern Circle Pattern ![]() Please Wait
Features
Thorlabs and RPC Photonics are proud to offer Engineered Diffusers™, which provide non-Gaussian intensity distributions in various patterns. We offer square, circular, and line distribution tophat patterns with a 90% transmission efficiency. The square and circular patterns are offered in 20° and 50° divergence angle options, while the line distribution has a 0.4° x 100° divergence. Typical diffusers do not offer this advanced light control. These Engineered Diffusers are designed for use with Ø0.5 mm or larger laser beams; smaller beams should be expanded prior to the diffuser. Our Engineered Diffusers are available unmounted or mounted. The mounted Ø1" diffusers come in an engraved SM1-threaded (1.035"-40) mount, as shown at the top of the webpage. The mount provides quick identification and helps protect the diffusers from fingerprints and other contamination. SM1 threading is particularly useful when building Please see the Technology tab above for more information on our Engineered Diffusers. ![]() Click to Enlarge SEM Picture of Engineered Diffuser for Display Brightness Enhancement ![]() Click to Enlarge SEM Picture of Engineered Diffuser for Projection Screens Engineered Diffuser Technology Homogeneous diffusers made of, for example, ground glass, opal glass, or holographic elements, consist of repeating, uniform surface patterns across the entire clear aperture that provide only limited control over the shape and intensity profile of the illuminated area, causing the incident light to be used inefficiently. In addition, holographic diffusers are usually limited to monochromatic applications using coherent light. On the other hand, Engineered Diffusers consist of differing, individually manipulated microlens units that provide broadband compatibility and excellent control over the light distribution and beam profile. Each microlens unit that forms the diffuser is individually specified with respect to its surface profile and location in the array. At the same time, to ensure that the diffuser is stable against variations in the input beam's intensity profile and usable in the visible and IR, the distribution of microlenses is randomized according to probability distribution functions chosen to implement the desired beam shaping functions. The microlens distribution also removes zero-order bright spots and diffraction artifacts from the output. In this manner, Engineered Diffusers retain the best properties of both random and deterministic diffusers. ![]() Click to Enlarge Diagram of Mastering Process Fabrication Comparison to Other Diffuser Technologies In contrast, Engineered Diffusers provide high transmission efficiencies and the ability to control the divergence angle, spatial distribution, and intensity profile of the diffused light.
Introduction Circular Pattern Diffusers Transmitted Intensity Plots
Square Pattern Diffusers Transmitted Intensity Plots
Line Pattern Diffuser Transmitted Intensity Plot
Experimental Set Up
![]() Click to Enlarge Note: High Performance Black Masking Tape was used to cover metal which might reflect laser light. A MFF101 Motorized Flipper with an empty LMR05 is not being used.
Procedure Experimental Limitations Results
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Unmounted optics are ideal for applications that are tight on space or that need added mounting flexibility. Our Ø1" unmounted Engineered Diffusers are commonly used in SM1-threaded (1.035"-40) lens tubes. The optic should be oriented so that incident light hits the engineered surface. ![]()
Our mounted Engineered Diffusers are the same as their unmounted counterparts, but are set in an SM1-compatible engraved mount. Mounted optics have the advantage that they are easy to identify and the optics are recessed in the mount so that they are better protected from contamination than unmounted optics. The optic should be oriented so that incident light hits the engineered surface first; when the optic is placed in its mount, this side will be closest to the retaining ring. ![]()
The EDK01 Engineered Diffuser kit includes five Ø1" mounted diffusers and a metal storage box. The SM1-threaded mounts are engraved with the item number and a brief item description. Please see the table to the right for the contents of this diffuser kit. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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