FRED Knowledge Base

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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#05 – FRED Technical Support Series

In v10.31 or later a new scripting command called SpectrumGetRandomWavelength was added which makes modeling wavelength conversion using a scripted surface or volume scatter model much simpler than in previous versions. This video demonstrates the new implementation in a simple fluorescence model. The FRED file created...

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Power vs Wavelength

In analyzing results from simulations involving polychromatic sources and dispersive elements, it may be of interest to examine the power reaching a detector as a function of wavelength. The script associated with this article can be used to generate such a data set after a...

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Quasi-realtime analysis display in 3D View

Many of our users are aware of the “Show in Visualization View” option available from the Chart pop-up menu after an “Energy” calculation. This feature overlays the results of a calculation at the Analysis Surface position in FRED’s 3D View. In the past, this feature...

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Eulumdat

As of version 10.40, FRED only supports export of photometric data in IES format. Customers requiring the Eulumdat file format may be interested in this tool for converting IES to LTD....

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