Photonics Dictionary: A

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absorption peak

An absorption peak refers to a sharp increase or spike in the absorption of electromagnetic radiation at a particular wavelength or energy level. It is a distinctive feature in the absorption...

actinic glass

Glass designed to absorb most infrared and ultraviolet radiation while transmitting most of the visible region.

active infrared system

imaging system which clearly shows the IR signals in the field of view as well as ambient environment

aiming beam

A visible laser beam generated coaxially with an infrared or other invisible laser beam to aid in its positioning.

alexandrite lasers

An alexandrite laser is a solid-state laser that utilizes a synthetic crystal made from the rare earth element alexandrite (BeAl2O4:Cr3+). This crystal is capable of emitting laser light in the...

analog thermogram -> thermogram

Also known as analog thermogram. The resultant photograph, illustrating, in tones ranging from black to white, the spatial relationship of the infrared radiation temperatures of the different details...

arc flash

An arc flash is a sudden release of electrical energy due to an electric arc — a continuous, high-current discharge of electricity between conductors or from a conductor to ground. Arc flashes...

arsenic trisulfide

A dark red opaque material that is transparent to the infrared beyond 1 µm.

attenuated total reflectance spectroscopy

Attenuated total reflectance (ATR) spectroscopy is a technique used in analytical chemistry to obtain IR spectra of samples. It is particularly useful for analyzing solid and liquid samples without...

attosecond-pump attosecond-probe spectroscopy

Attosecond-pump attosecond-probe spectroscopy (APAP) is an advanced technique in ultrafast spectroscopy that allows scientists to study the dynamics of electronic processes occurring on extremely...

Photonics DictionaryA

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