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light sources Dictionary Terms

laser output
The laser output refers to the generated and emitted light produced by a laser system. This output is characterized by...
quantum cascade laser
A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics....
optical testing instrument
An optical testing instrument is a device or system used to evaluate and measure the performance, quality, and...
light-emitting diode
An LED, or light emitting diode, is a semiconductor device that emits light when an electric current passes through it. LEDs...
photonics
The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The...
chip-on-board lights
Chip-on-board (COB) lights refer to a type of LED lighting technology where multiple LED chips are directly mounted onto a...
helium-neon laser
A helium-neon (HeNe) laser is a type of gas laser that emits visible red light at a wavelength of 632.8 nm. It operates...
bench photometer
A device used to compare the luminous intensities of two sources by locating a point between the two light sources where the...
optical filter
An optical filter is a device that selectively transmits or blocks specific wavelengths, or colors, of light. Optical...
photobiomodulation
A light therapy that utilizes nonionizing light sources, including lasers, LEDs, and broadband light, in the visible and...
fiber-coupled LED
A fiber-coupled LED (light-emitting diode) refers to an LED device that is optically coupled to an optical fiber for the...
image intensifier
An image intensifier, also known as an image intensification tube or image intensification device, is a specialized...
arc light source
In present usage, especially for spectroscopic identification, an arc between electrodes that serves as a radiation source....
polarization
Polarization refers to the orientation of oscillations in a transverse wave, such as light waves, radio waves, or other...
reflective
The term reflective is an adjective that describes the ability of a surface or material to reflect light or other forms of...
colorimeter
A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides...
image plane holography
A hologram in which the image of an object, or the object itself, is located near the hologram recording plane, for optimum...
photographic photometry
A form of photometric measurement, often used with light sources that are transparent or fluctuating, in which a...
light diffusion
Light diffusion refers to the process by which light is scattered or spread out in various directions as it interacts with a...
light fidelity
LiFi, short for light fidelity, is a wireless communication technology that utilizes visible light or infrared light to...
monochromator
A monochromator is an optical instrument used to isolate and select a narrow range of wavelengths from a broader spectrum of...
fluorescent whitening agents
Agents used for testing light sources and natural daylight with visual and instrumental assessment using a set of white...
GaN-based LEDs
Gallium nitride-based light-emitting diodes (GaN-based LEDs) are semiconductor devices that emit light when an electric...
synchrotron
A synchrotron is a type of particle accelerator that uses magnetic fields to steer charged particles, typically electrons or...
functional near-infrared spectroscopy
Functional near-infrared spectroscopy (fNIRS) is a non-invasive neuroimaging technique that measures changes in hemoglobin...
photodynamic therapy
A medical technology that uses lasers or other light sources in combination with photosensitizing drugs to treat cancerous...
nanoLED
An LED (light-emitting diode) is a semiconductor device that emits light when an electric current passes through it. LEDs...
holographic grating
A holographic grating is a type of diffraction grating that is produced using holographic recording techniques. It consists...
ray tracing
Ray tracing is a rendering technique used in computer graphics to simulate the way light interacts with objects in a scene....
spectroradiometer
A spectroradiometer is a device used to measure the intensity of light at different wavelengths across the electromagnetic...
wedge photometer
A photometer that uses a wedge, marked to show its reduction of flux density, to make two light sources equal in intensity...
infrared light source
An infrared light source is a device that emits light in the infrared spectrum, which lies beyond the visible spectrum of...
nonlinear optical materials
Nonlinear optical materials are substances that exhibit optical properties that are not linearly proportional to the...
lumen
A lumen is a unit of measurement used to quantify the amount of luminous flux, which is the perceived power of light. In...
Lloyd's mirror
A mirror employed with a very high incidence angle to form a pair of coherent light sources by reflection, and therefore...
distributed feedback laser
A distributed feedback laser (DFB laser) is a type of semiconductor laser diode designed to emit coherent, narrow-bandwidth...
octave
In optics, an octave typically refers to a range of frequencies or wavelengths that spans a factor of 2. In other words,...
frequency comb
A frequency comb is a precise and regular series of equally spaced spectral lines, or frequencies, that are generated with...
supercontinuum
Supercontinuum refers to a broad spectrum of light that spans a wide range of wavelengths, typically from the visible to the...
phototherapy
Phototherapy is a medical treatment that involves the use of light to treat various conditions, particularly those related...
comparison lamp
A reference incandescent light source having a luminous intensity that is used in photometry for comparison of other light...
GaAlAs laser
A GaAlAs laser is a type of semiconductor laser diode that emits light in the near-infrared region of the electromagnetic...

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