## Why Can I Not Place a Thermal Pickup on the Conic Constant?

On certain surface parameters, Zemax does not allow the placement of a thermal pickup solve. This article explains why.

Authored By: Nam-Hyong Kim

Published On: March 19, 2007

## How to Set the Lens Mount Reference for Thermal Analysis

This article demonstrates how the mechanical reference for the  lens mount can be arbitrarily changed.

Authored By: Nam-Hyong Kim

Published On: September 26, 2006

## How Does Zemax Model the Thermal Expansion of Optical Mounts?

This article explains how the TCE column in the Lens Data Editor is used to model optical mounts between lenses.

Authored By: Nam-Hyong Kim

Published On: March 19, 2007

## How to Fit Temperature-Dependent Index Data to the Zemax Thermal Model

This article explains how to fit the observed temperature variation of discrete (e.g. experimental) refractive index data to the Zemax thermal model.

Published On: October 30, 2008

## How to Model Thermal Effects Using Zemax

This article demonstrates the thermal modeling capabilities available both in the EE and SE versions of Zemax. The sample files can be donwloaded from the last page of this article.

Authored By: Nam-Hyong Kim

Published On: July 21, 2006

## What is a Ray?

• What a ray is
• Rays and wavefronts
• Coordinates, cosines, and propagation
• Refraction, reflection, and diffraction
• Amplitude. phase and optical path

Authored By: Ken Moore

Published On: December 2, 2015

## Understanding Paraxial Ray-Tracing

• What paraxial rays are
• What parabasal rays are
• Differences between them that can cause confusion

The article is accompanied by a ZIP archive containing the samples used and a macro. This can be downloaded from the final page of the article.

Authored By: Mark Nicholson

Published On: July 21, 2005

## What is an "Effective F-Number"?

• The meaning of F-Number for optical systems with non-circular stops
• The theoretical basis for the defined effective F-Number in Zemax

Authored By: Ronian Siew

Published On: December 29, 2015

## How to Model Corner-Cube Retroreflectors

Corner Cube retroreflectors are commonly used in a wide range of optical systems. This article describes various different ways in which these components can be modeled in Zemax OpticStudio. The treatment can be as detailed as the user needs, with effects due to face misalignment, roofline straddling, thin-film coatings, diffraction etc included as required.

Authored By: Mark Nicholson

Published On: December 14, 2015

## How to Debug a Double-Pass Lens File

This article describes an easy way to test whether a double-pass lens file is correctly set up, or not, and to identify where any errors are.

Authored By: Mark Nicholson

Published On: January 4, 2016

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