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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Related Experiment Video

Updated: Jun 15, 2026

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Simple Cassegrain scanning system for infrared astronomy.

J Apt, R Goody, L Mertz

|March 12, 2010

Summary

A new Cassegrain reimaging system offers an inexpensive, compact solution for scanning infrared (IR) images. This system matches or exceeds the performance of conventional scanning secondaries.

Area of Science:

Optics and Photonics
Infrared Imaging Technology
Optical System Design

Background:

Conventional scanning secondaries in infrared (IR) imaging systems can be complex and costly.
There is a need for simpler, more economical, and compact optical solutions for IR image scanning.

Purpose of the Study:

To describe a novel, simple, inexpensive, and compact Cassegrain reimaging system.
To evaluate the performance of this new system for scanning IR images.

Main Methods:

Design and construction of a Cassegrain reimaging system.
Comparative performance analysis against conventional scanning secondary systems.

Main Results:

The developed Cassegrain reimaging system is simple, inexpensive, and compact.

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Related Experiment Videos

Last Updated: Jun 15, 2026

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Performance metrics are comparable or superior to conventional scanning secondaries in key aspects.

Conclusions:

The Cassegrain reimaging system presents a viable and advantageous alternative for IR image scanning.
This system offers a cost-effective and high-performance solution for IR imaging applications.