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.

Essentials of Laser Safety

Technical Notes

Learn about laser classifications and the controls and protective equipment required to stay safe.

Fundamentals of Laser Diode Control

Technical Notes

To assess the quality, performance, and characteristics of laser diodes, manufacturers often perform exhaustive testing which requires electro-optical, spectral and spatial characterization of the laser output.

Thermopile Sensor Physics

Technical Notes

Thermopile sensors are based on thermocouples. A thermocouple consists of two dissimilar metals connected in series. To detect radiation, one metal junction is typically blackened to absorb the radiation.

Pyroelectric Sensor Physics

Technical Notes

A pyroelectric crystalline material has electric polarization even in the absence of an applied voltage. On heating, the material expands and produces a change in the polarization which builds up a charge on the opposite surface.

Photodiode Sensor Physics

Technical Notes

A photodiode sensor consists of a semiconductor p-n junction. Light falling on the junction causes the formation of electron-hole pairs. In photovoltaic mode, the electron-hole pairs migrate to opposite sides of the junction, producing a voltage.

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.

Laser Physics

Technical Notes

A laser is a source of coherent light. It contains an optical oscillator that increases the amplitude of an optical field while maintaining its phase. This coherent amplification is achieved through Light Amplification by Stimulated Emission of Radia...

Light-Matter Interactions in Lasers

Technical Notes

Light is generated from a laser as a result of the following process: electrons in a material move from an excited energy level to a lower-lying energy level and produce photons that contribute to the laser beam.
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