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Photonics Dictionary: A

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absorption spectrophotometer
Measures the absorption or sample transmittance over a range of specified wavelengths. Sample may be placed within the device and the transmission measured to an accuracy of given percent. The...
absorption spectroscopy
Experimental method of measuring the transmission of a given sample as a function of the wavelength.
absorption spectrum
Fraction absorption over a specified range of wavelengths.
The measured change in absorption at a single wavelength while altering experimental parameters such as the incident intensity or pulse width.
alternating current
automatic current control
An accelerometer is a sensor or transducer that measures the rate of change of velocity of an object, or in simpler terms, it measures acceleration. Accelerometers are widely used in various...
acceptance angle
The range of angle or solid angle values by which light may enter an optical system.
acceptance pattern
A curve expressing an optical fiber's total transmitted power as a function of its launch angle at the input.
Impurity in a semiconductor or any other electroluminescent device capable of inducing hole conduction and accepting a valence band electron to produce an acceptor energy level.
accessible emission
The present radiation level within a laser or electromagnetic radiation operating area.
accessible radiation
Electromagnetic radiation present upon the open aperture of the source within an operating environment.
accessory shoe
Mount attached to a camera or camcorder which allows the user to attach a microphone or flash unit.
accommodation -> ocular accommodation
The physical adaption of the eye lens, by means of ciliary muscle contraction, in order to maintain a clear, in focus image of light and other objects and surroundings at a given distance onto the...
A broadband continuum resonator that confines a wide range of wavelengths. From the optical confinement a single wavelength may be released by means of a tuning grating.
acetate film
Also cellulose acetate film. The emulsion layer applied to the substrate of a photographic surface. The emulsion layer is composed of small particles suspended in gelatin solution.
Optic surface cleaning liquid that may be applied to glass, crystal, dielectric and metal surfaces; however, may not be applied to plastic and polymer materials.
An achromat, in the context of optics, refers to a type of lens or lens system designed to reduce chromatic aberration. Chromatic aberration is an optical phenomenon where different colors of light...
Color correcting; chromatic aberration corrected.
achromatic lens
A lens consisting of two or more elements, usually of crown and flint glass, that has been corrected for chromatic aberration with respect to two selected wavelengths. Also known as achromat.
achromatic point
Location on the CIE chromaticity diagram which produces the color white for a given light source at a specified temperature.
achromatic prism
Cemented prisms of differing refractive indices which refract incident light and, due to differing refractive indices, will not spatially separate individual wavelengths.
Use of achromatic design; the correction of chromatic aberration; without color or hue (grey, black and white)
software package Atmospheric Correction Now
acoustic surface wave -> surface acoustic wave
An acoustic wave that propagates along the surface of a solid and decays exponentially with substrate depth. Also called a Rayleigh wave, it has both longitudinal and transverse (shear) components....
acoustical hologram
The recorded interference pattern formed by the interference of two sound beams.
acoustical holography
The optical reconstruction of image information contained in a sound field. First the diffraction pattern, formed by an object irradiated by ultrasonic rays, interferes with a mutually coherent...
acousto-optic deflection
The angular change of an incident beam due to vibrational induced refractive index changes within a crystal.
acousto-optic deflector
A system designed with a laser as a light source and a means for producing sound waves extending beyond 100 MHz to deflect light efficiently.
acousto-optic diffraction
Light diffracted by a solid (usually quartz in crystal or fused form) traversed by acoustic waves. If the ultrasonic wavelength is larger than the diameter of the light beam, the diffraction orders...
acousto-optic modulation
The altering of lightwaves by acoustic waves in a solid medium.
acousto-optic modulator
A device that varies the amplitude and phase of a light beam; e.g., from a laser or by sound waves. Also known as a Bragg cell.
acousto-optic modulators and deflectors
An acousto-optic modulator (AOM) is a device that utilizes the interaction between sound waves and light waves to modulate or control the intensity, frequency, phase, or direction of laser beams. It...
acousto-optic tunable filter
A bulk crystalline optic which permits the propagation of light through a volume of index altered material. The variation in refractive index along the material volume is due to a piezoelectric...
Discipline within optical physics that addresses sound vibration, phonon effects and their influencing behavior within optical elements and systems.
acoustophotorefractive effect
The change in refractive index that occurs as acoustic vibrations are transmitted through an optical material.The index changes are periodic in relation to the frequency, spatial orientation, and...
acquisition control processor
active-cavity radiometer
A thermoplastic or optically transmitting hard plastic produced by applying polymerization initiator and heat to a monomer.
American Chemical Society
AC thin film electroluminescent display devices
Stimulating light used for the production of energy through photosynthesis, solar cell or other light senstitive device.
actinic focus
That point in the electromagnetic spectrum at which an optical system focuses the most chemically effective rays.
actinic glass
Glass designed to absorb most infrared and ultraviolet radiation while transmitting most of the visible region.
actinic radiation
Electromagnetic energy that is capable of producing photochemical activity.
Any of a series of radioactive elements with atomic numbers ranging from 89 to 103.
The creation of a chemical reaction in a substance when radiation is directed to it.
The study of chemical changes produced by radiation.
A device that measures the intensity of photochemically active radiation, particularly from the sun. One form of this instrument determines the fluorescence initiated by the radiation.
Actinometry refers to the measurement of the intensity of radiation, particularly ultraviolet (UV) radiation or sunlight. It is commonly used in atmospheric science, environmental monitoring, and...

Photonics DictionaryA

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