Please note that the Zemax file provided below is not the common sequential (SC) raytracing file which we typically provide, but the non-sequential (NSC) raytracing file. It is recommended that the mixing rod be mounted centered in the mount, so that no more than 5 mm of the rod extends past the edge of the mount on either side. Mounting the rod with the nylon-tipped setscrews in contact with an edge of the hexagonal rod will limit the contact between the setscrew and the optical surface, improving the optical performance. Please note TIR will be interrupted where the nylon touches the planar surface of the rod. Fixing the two setscrews onto a planar side of the rod will provide more mechanical stability. There are two methods of mounting these hexagonal rods in the adapters. These adapters use two 5/64" (2.0 mm) hex, nylon-tipped setscrews to press the component against the two lines of contact created by the double-bored mounting hole. Thorlabs offers the AD48FA and AD48F adapters to mount these rods with their optical axis aligned with the center of SM05- or SM1-threaded lens tubes, respectively. ![]() Since the homogenously distributed light is on the output surface, we recommend a working distance of 3 mm. Regardless of individual spectral characteristics, the light of one or more point sources can be mixed and homogenized using these rods. These rods can be used with non-uniform light sources such as laser diodes and LEDs. The larger the incident angle, the fewer total number of reflections within the rod as seen in the family image above. The number of reflections of every ray depends on the incidence angle. These rods are manufactured from UV fused silica, which has a refractive index of 1.458 at its d-line of 587.6 nm, meaning θ c is 43.3°. Where n is the refractive index of the material. The index of refraction is the only factor that affects the critical angle, defining the angle where TIR will occur. Our BBAR coatings provide <0.5% average reflectance per surface over 350 - 700 nm (-A) or 650 - 1050 nm (-B), thereby reducing surface losses. Our UVFS hexagonal light mixing rods are available uncoated or with one of two of our standard broadband antireflection (BBAR) coatings on the ends of the rod. TIR inside the rod ensures the generated output light is a flat top profile at the exit surface. If light enters at an incident angle that is greater than or equal to the critical angle (θ c), total internal reflection (TIR) occurs and light is transmitted through the rod as seen in the diagram on the right. Thorlabs' Hexagonal Light Mixing Rods are ideal for applications that require homogenization of non-uniform light, such as LED illuminators and OEM illumination projects. For Other Mixing Rod Lengths and AR Coatings, Contact Tech Support.Available Uncoated or with Broadband Antireflective (BBAR) Coating Options:.Total Internal Reflection Transmits Light Through the Rod. ![]()
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