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Alluxa - Optical Coatings LB 8/23
Filters Dictionary Terms

notch filter
Also referred to as a band-stop or band rejection filter; a notch filter is a filter that is designed to screen out a very...
thin-film coating
Thin-film coatings are layers of material applied to the surface of an object or substrate, typically to modify its optical,...
volume Bragg gratings
Volume Bragg gratings (VBGs) are specialized optical elements that consist of periodic variations in refractive index...
photoelectric colorimetry
The measurement and analysis of color using a photoelectric instrument having three filters with broad spectrum bands.
wide-field fluorescence microscopy
Wide-field fluorescence microscopy uses either naturally occurring structures or staining with fluorescent tags that are...
birefringence
Birefringence is an optical property of certain materials that causes them to exhibit different refractive indices for light...
long-pass filter
A long-pass filter is an optical filter that allows longer wavelengths of light to pass through while blocking or...
optical assembly
An optical assembly refers to a collection of optical components that are carefully arranged and aligned to perform a...
covered groove
A technique used in integrated optics where a groove is cut on a substrate surface and covered by a thin film to facilitate...
subtractive color process
The basic process of color photography whereby colors are subtracted from white light by means of filters, making all colors...
color temperature meter
A device containing two photocells behind deep red and blue filters to measure color temperatures. The amplifier gain is...
interferometric modulator display
Interferometric modulator display (IMOD) is a type of display technology used in electronic devices, known for its energy...
microreciprocal degree
An approximated measure of the smallest change in color temperature detectable by the human eye, defined as the reciprocal...
flame photometer
Any of a number of instruments that uses a flame to vaporize a solution of the chemical being analyzed so that light may be...
dichroic coating
A dichroic coating, also known as a dichroic filter or dichroic mirror, is an optical coating designed to selectively...
filter wheel
A device that holds a number of filters and allows the filter with the desired characteristics to be rotated into an optical...
optical glass
Optical glass refers to a type of glass specifically engineered and manufactured for use in optical components and systems,...
phase distrortion
Phase distortion refers to a change in the phase relationships between different frequency components of a signal. In the...
multiband camera
A group of four cameras loaded with different combinations of filters and film (one is usually an infrared color film) to...
plasmon ion-assisted deposition
Plasmon ion-assisted deposition (PIAD) is a technique used in thin-film deposition processes, particularly in the production...
anaglyph
An image that can be studied three-dimensionally through a pair of complementary color filters composed of two superimposed...
optical filter
An optical filter is a device that selectively transmits or blocks specific wavelengths, or colors, of light. Optical...
photonic crystals
Photonic crystals are artificial structures or materials designed to manipulate and control the flow of light in a manner...
optical manufacturing tools and machinery
Optical manufacturing tools and machinery encompass a wide range of equipment, instruments, and systems used in the...
photonic integrated circuit
A photonic integrated circuit (PIC) is a compact and integrated device that incorporates multiple photonic components and...
three-filter densities
Integral densities that are measured relative to arbitrarily selected red, green and blue filters.
photonic cavity
A photonic cavity, also known as an optical cavity, is a structure that confines electromagnetic radiation within a certain...
indium gallium arsenide camera
An InGaAs (indium gallium arsenide) camera is a type of imaging device that utilizes InGaAs sensors to capture images in the...
laser eyewear
Usually consists of a set of filters that attenuate specific wavelengths but transmit as much visible radiation as possible.
separation filters
Three filters used in making a color print of a color negative, red, green and blue-violet, respectively. Each filter...
polarization
Polarization refers to the orientation of oscillations in a transverse wave, such as light waves, radio waves, or other...
optical materials
Optical materials refer to substances or compounds specifically chosen for their optical properties and used in the...
micro-ring resonator
A micro-ring resonator is a compact optical device that utilizes the resonant behavior of light within a small ring-shaped...
resonator
A resonator is a device or system that exhibits resonance, which is a phenomenon that occurs when an external force or...
infrared optic
Infrared optics refer to optical components and systems designed to manipulate and control infrared (IR) light, which lies...
Ruticon
A ruticon is an opto-electronic device in which light going through it can be modulated by an electric field. The...
fiber Bragg grating
A fiber Bragg grating (FBG) is a type of optical filter that is inscribed or "written" into the core of an optical fiber. It...
cold-light illumination
A means of illumination from which the infrared component has been removed by absorption or reflection filters within the...
cineradiography
The photographic filming of the action of x-ray images recorded on a fluorescent screen by means of large lens apertures and...
optical staining
With respect to microscopy, also called dispersive staining, optical staining the projection of colors through areas of a...
liquid crystal on silicon
Liquid crystal on silicon (LCoS) is a display technology that combines liquid crystal materials with silicon-based...
hyperspectral imaging camera
A hyperspectral imaging camera is a sophisticated imaging device capable of capturing and processing data across a wide...
liquid gate
An immersion liquid used to treat polarizing filters to eliminate the effects of surface variations and to minimize the...
custom optic
A custom optic refers to an optical component that is designed, manufactured, and tailored to meet specific requirements or...
novelty filter
A filtering device that detects what is new in a scene of interest. Often compared to that of a temporal high pass filter,...
broadband filter
A broadband filter is an electronic or electromagnetic device designed to pass a range of frequencies or signals within a...
multispectral photography
The use of narrow bandpass filters and special photographic emulsions to discern features of a surface that would not be...
minimum object distance
Minimum object distance, often abbreviated as MOD, refers to the closest distance at which a camera lens or optical system...
waveguide
A waveguide is a physical structure or device that is designed to confine and guide electromagnetic waves, such as radio...
filter spectrophotometer
A spectrophotometer that makes use of filters to isolate narrow bands of the spectrum.
laser optics
Laser optics refers to a broad category of optical components and systems designed for manipulating and controlling laser...
frequency domain
The frequency domain is a concept used in signal processing and analysis to represent signals and data in terms of their...
optical cements and adhesive
Optical cements and adhesives are specialized materials used in the assembly and bonding of optical components in optical...
optical coatings
Optical coatings are thin layers of materials applied to optical components, such as lenses, mirrors, filters, and prisms,...
near-infrared camera
A near-infrared (NIR) camera is an imaging device designed to capture images in the near-infrared region of the...
piezo-optical transducer
A structure consisting of a thin film of liquid crystal sandwiched between light-polarizing filters that have received a...
optical design and engineering services
Optical design and engineering services involve the development, customization, and optimization of optical systems and...
machine vision lens
A machine vision lens is a specialized optical lens designed for use in machine vision systems, which are used for automated...
interference filter
A filter that controls the spectral composition of transmitted energy partially by the effects of interference. Frequently,...
optical design software
Optical design software refers to specialized computer programs used by optical engineers, physicists, and designers to...
integrated optics
A thin-film device containing miniature optical components connected via optical waveguides on a transparent dielectric...
vacuum apparatus
Equipment dependent on the effects of a vacuum. The principal applications in optics are in the coating of lenses and...
whispering gallery mode
Whispering gallery mode (WGM) refers to a phenomenon in wave physics, particularly in optics, where waves, such as light or...
inner focusing
In a camera, the movement of one or more lenses behind the front lens, rather than of the front lens itself, to bring the...
colorimetric photometer
A photometer that uses a set of color filters to measure the intensity of light in various regions of the spectrum.
multispectral imaging
Multispectral imaging is a technique that involves capturing and analyzing images at multiple discrete spectral bands within...
second-harmonic generation microscopy
A nonlinear label-free imaging technique commonly used during surgical procedures for the visualization of collagen fibers...
nanophotonics
Nanophotonics is a branch of science and technology that explores the behavior of light on the nanometer scale, typically at...
solar simulator
A solar simulator is a device used to replicate the spectrum and intensity of sunlight in a controlled environment for...
half bandwidth
The term half bandwidth (HBW) generally refers to the width of a spectral band or frequency range at half of its maximum...
spectral flow cytometry
Spectral flow cytometry is an advanced flow cytometry technique that expands the capabilities of traditional flow cytometry...
thin film
A thin layer of a substance deposited on an insulating base in a vacuum by a microelectronic process. Thin films are most...

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