Technical Notes

Fundamentals of Spatial Filtering

Technical Notes

Spatial filters provide a convenient way to remove random fluctuations from the intensity profile of a laser beam. This greatly improves resolution — which is especially critical for applications like holography and optical data processing.

Polarization Control with Optics

Technical Notes

Precise control of polarization behavior is necessary to obtain optimal performance from optical components and systems. Characteristics such as reflectivity, insertion loss, and beamsplitter ratios will be different for different polarizations.

UAV Imaging Systems

Technical Notes

When equipped with high-performance thermal imaging systems, UAVs, also known as drones, lend themselves to a wide range of defense, government, and commercial applications.

Beam Expanders

Technical Notes

Simple beam expanders are essentially telescopes which, in their most basic forms, consist of two lenses. The input beam is assumed to be collimated. The first lens must have a diameter larger than the diameter of the input beam to avoid clipping the...

Variable Laser Attenuators

Technical Notes

Variable laser attenuators consist of essentially two optical components, a half waveplate, and a polarizer with a good extinction ratio, and allow for continuous power control for linearly polarized lasers.

Optical Mirror Physics

Technical Notes

Optical mirrors consist of metallic or dielectric films deposited directly on a substrate such as glass, differing from common mirrors, which are coated on the back surface of the glass.

Optical Coatings

Technical Notes

Optical coatings typically consist of thin films made up of single or multiple layers of either metallic or dielectric materials. When properly designed and fabricated, these coatings can dramatically modify the reflection and transmission properties...

Optical Filter Characteristics

Technical Notes

In addition to being deposited on the surface of an optical component, optical coatings can also be incorporated into a single element through deposition on one or many substrates followed by a lamination process.

Optical Lens Physics

Technical Notes

Lenses are essentially light-controlling elements and so are exploited for light gathering and image formation.

Fiber Optic Physics

Technical Notes

This technical note discusses the fundamental physics of optical fibers, their practical implementation, and the various types of optical fibers.
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