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## How to Determine Which Material Catalog is Being Used

This article explains how to determine which material catalog is being used as the source of the material data for a specific surface/object. This is especially important when multiple material catalogs are loaded containing one or more materials with the same name.

Authored By: Andrew Locke

Published On: September 17, 2015

## How is a MIRROR Without a Coating Handled?

Question: I have a MIRROR surface or object, but I have not defined a coating for it. How is its reflectivity accounted for?

Authored By: Mark Nicholson

Published On: August 20, 2015

## How to Model Thermal Gradients in an Interferometer Cavity

This article shows how to model a linear thermal gradient in a double-pass system. The method can be easily extended to more complex gradients.

Authored By: Michael Pate

Published On: June 23, 2008

## How to design afocal systems

This article covers afocal system design and optimization in OpticStudio. In particular, we discuss what afocal systems are, how to analyze afocal systems in terms of angular units, how to handle cylindrical systems, and how to work with systems with multiple focal and afocal spaces.

Authored By: Mark Nicholson

Published On: September 23, 2015

Authored By: Liz Gerrish and Alissa Wersal

Published On: August 26, 2015

## How to Specify Fields for Non-Rotationally Symmetric Systems

This article explains how to assign appropriate weight for the on-axis field when specifying fields for non-rotationally symmetric systems.

Authored By: Name-Hyong Kim

Published On: September 18, 2015

## What is The Birefringent Mode Flag For?

Question: Zemax OpticStudio supports four birefringent mode flags on the Birefringent_In surface. What are they for, and when do I use them?

Authored By: Mark Nicholson

Published On: August 26, 2015

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