geometry Tag

Rectangular Lenslet Arrays

Lenslet arrays are used in a variety of applications that include beam homogenization.  This knowledge base article demonstrates the setup of an imaging lenslet array for creating uniform incoherent illumination on a detector.  The input beam has a gaussian profile with half width equal to...

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Cylindrical Lens Creator

FRED does not currently include a built-in cylindrical lens creator. Cylindrical lenses must be entered either manually surface by surface or by adding a catalog cylindrical lens and adjusting it accordingly. This knowledge base article includes a script that generates a cylindrical lens based on...

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Truncated Cone Builder

This knowledge base article demonstrates a script that will create a truncated cone subassembly consisting of two end planes and a tapered cylinder.  The cone is specified by the two end surface radii and the axial height of the truncated cone.  In this implementation r1...

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Draw NURB Curve Control Points

This knowledge base article demonstrates a simple utility that can be used to draw a sphere at the position of each control point in a NURB curve.  This can be useful for visualization purposes when constructing geometry made from this curve type.  The designated NURB...

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Surface Height Profiler

This knowledge base article describes a utility which calculates the surface sag for each pixel in a 2D grid placed over the entity’s outer trimming volume. Pixels outside of the trimming volume bounds are populated with “hole” values while pixels inside of the trimming volume...

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Wollaston Prism Polarizer

A Wollaston prism polarizer consists of two right angle prisms made of a uniaxial crystal such as calcite, which is commonly used for Wollaston prisms. The two pieces of uniaxial crystal are oriented such that the crystal axes are perpendicular to each other. Using the...

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Arizona Eye Model

Optical models of the human eye are used for designing ophthalmic devices and optical systems meant to be used with human eyes. This knowledge base article demonstrates one such model: the Arizona Eye Model, which is described in the SPIE “Field Guide to Visual and...

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Off-Axis Parabolic Mirrors

The current FRED catalogs do not contain off-axis parabolic mirrors for simple import into a document. This knowledge base article describes a utility that accepts parameters provided by the Edmund Optics catalog to automatically create the corresponding OAP as a closed geometry. During creation, the...

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Pickup Parameters

This knowledge base article discusses how to use FRED’s Pre-Update Script tool to implement pickup parameters, similar to what you might find in a sequential lens design code.  A pickup parameter is traditionally used to tie one surface parameter to another, setting RB = -RA,...

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