Get high-quality focused spots and a long working distance – without a complex optical system – using these high-performance mirrors.

Optimize results in welding, cladding, and heat-treating applications by converting a high-power, Gaussian laser beam into a “flat-top,” intensity distribution focused spot.

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The Coherent HyperRapid NXT 266 is the world's first industrial-grade deep UV, picosecond laser, offering extraordinary precision manufacturing as small as 5 µm.

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Our Polymer 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 Ø1" lens tube and 30 mm cage systems. These mounted diffusers are available individually or as a set of all five in a labeled storage box.

Opticaldiffuser

Thorlabs offers Polymer Engineered Diffusers®*, which provide non-Gaussian intensity distributions in square, circular, and line distribution patterns. 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 level of light control.

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ResultsIt was found that there was little variance in diffuse beam profile with respect to wavelength across the middle of each beam profile. Above, to the left of the page, are the theoretical estimations of intensity across the width of the resulting beam profile. To the right of the page are data compiled from independent tests with various laser wavelengths to verify the theoretical models.

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Our mounted Engineered Diffusers are the same as their unmounted counterparts, but are set in an engraved mount with internal SM1-threading (1.035"-40). 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 surface will face the retaining ring.

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Engineered Diffuser® TechnologyThorlabs' Engineered Diffusers provide advanced beam shaping that leads to significant performance enhancements for applications as diverse as lithographic systems, outdoor lighting, displays, backlighting, display brightness enhancement, and projection screens.

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.

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These cost-effective Engineered Diffusers are made from injection molded ZEONOR polymer and have 90% transmission efficiency from 380 nm - 1100 nm. They are ideal for low-power applications and are designed for use with Ø0.5 mm or larger laser beams; smaller beams should be expanded prior to the diffuser. For high-power applications or applications requiring UV transmission, Thorlabs offers UV Fused Silica Engineered Diffusers.

Learn about the vertically integrated capabilities for material growth, fabrication, coating, and assembly, and rigorous QA at Coherent. Discover how these ensure the performance and reliability of our optics and minimize supply chain risks and uncertainties.

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Build high-performance, cost-effective galvanometer scanning systems with these silicon mirrors that combine exceptional thermal stability and high reflectivity.

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.

IntroductionThese Polymer Engineered Diffusers® are designed to create non-Gaussian intensity distributions in circular or square beam profiles that diverge from the plane of incidence. Below, to the left of the page, are the theoretical approximations of the intensity through the center of the diverging beam profile when illuminating the engineered diffusers with a 633 nm collimated beam. To the right are data compiled from independent tests with laser wavelengths of 488 nm, 637 nm, 785 nm, and 1064 nm to demonstrate the change in output profile with wavelength. The highlighted region of each graph denotes the divergence angle of the engineered diffuser. At the bottom of this tab is a description of the laboratory setup and procedure used to collect these data and the results.

Experimental LimitationsOnly one of each Item # was testedb. Stability may have been compromised by the experiment being performed on a PBG11113c breadboard without any isolation. Only the middle of each diffuse shape was measured, so variances in other areas of the shape are possible, including the corners of the square profiles.

Unmounted optics are ideal for applications that are tight on space or that need added mounting flexibility. Our Ø1" unmounted Polymer 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 first.

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Improve results in CO₂ laser cutting, drilling, and other materials processing tasks with optics that combine the properties of a focusing mirror and an axicon.

Apr 1, 2021 — The refractive index is measured by the reflection from an arbitrary surface of the sample; therefore, the structural parameters are not needed.

This is a 0.5X C-mount reduction lens for AmScope MU series cameras. Easy to attach, this threaded lens will decrease the camera port's magnification by ha…

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These build-to-print optics are available over a wide range of sizes and shapes, and with coatings optimized for any wavelength in the 1.0 µm to 12.0 µm range, plus dual-wavelength coatings to reflect an IR laser and visible alignment beam.

ProcedureFour wavelengths of light were chosen for study: 488 nm, 637 nm, 785 nm, and 1064 nm. These were prepared using the equipment to the right (a full list of all parts used can be found under the photo of the Experimental Set Up). The optical path was approximately 35 cm above the surface of the breadboard; it began when fiber-coupled light sources were collimated with triplet collimators, using a design wavelength as close to the source wavelength as possible. In free space, the beams were incident upon one of the Polymer Engineered Diffusers. The exiting divergent profile was isolated and focused by an LA1304 plano-convex lens attached to an SM05L20 lens tube. The signal was sampled every 0.5° by a SM05PD1A photodiode. This assembly was mounted on the end of an XT34-500 rail. The opposite end of the rail was mounted to a previous-generation NR360Sa rotation stage centered with the engineered diffuser under test in order to sweep the detector and lens assembly through the center of the profile, as illustrated below, and plot normalized intensity versus output angle. The distance between the diffuser and the detector was approximately 43 cm. The output angle was defined with respect to the original optical axis when the diffuser was not within the path. In order to control for ambient light, a 1 kHz sine wave was used to modulate the drive current applied to the laser diode and the signal was acquired with a lock-in amplifier. A LabVIEW program was written to control the setup and acquire the data.

For more information on Engineered Diffuser technology and performance, please read our Optical Diffusers Catalog Presentation.

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FabricationThe master microlens array is produced by a laser writing system developed by VIAVI Solutions, Inc. This system exposes a thick layer of photoresist point-by-point in a raster scan mode, as shown to the left. By modulating the intensity of the laser beam as it is scanned, the degree to which the photoresist is exposed can be varied. A deeply textured, engineered surface is the result, as shown above in the two SEM images of the surface topography.

Comparison to Other Diffuser TechnologiesOther common diffuser types include prismatic glass integrating bars, ground glass, opal glass, holographic diffusers, and diffractive diffusers. Prismatic glass integrating bars, though sometimes used in high-end systems, are expensive and occupy a great deal of precious space. Ground and opal glass scatter light equally in all directions but with a low degree of control. In addition, efficiency is generally poor with these simple diffusers. Holographic diffusers are an improvement on these technologies and enable limited production of light distribution patterns, but only offer Gaussian-like intensity profiles and circular or elliptical patterns. In terms of general beam shaping capability, diffractive elements can shape an input beam arbitrarily. However, they are confined to narrow diffusion angles, highly sensitive to wavelength, and cannot eliminate zero-order bright spots collinear with the incident beam. 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.

Create high-performance scanning systems using prismatic, pyramidal, and irregular polygons scan mirrors, available with metal coatings for IR, NIR, and visible lasers.

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The EDK01 Polymer Engineered Diffuser® kit includes five Ø1" mounted diffusers and a labeled 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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