Meadowlark Optics - Wave Plates 6/24 LB 2024

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Excelitas PCO GmbH - PCO.Edge 11-24 BIO MR

Edmund Optics - Manufacturing Services 8/24HP

8,726 terms

Photonics Dictionary

bandpass

The range of frequencies that will pass through a filter or other device. Synonymous with passband.

bandpass filter

A filter with a transmission that is high for a particular band of frequencies, but that falls to low values above and below this band.

bandstop filter -> band-elimination filter

A filter that suppresses a given range of frequencies, transmitting only those above and below that band. Also called bandstop filter.

bandwidth

The range of frequencies over which a particular instrument is designed to function within specified limits. See also fiber bandwidth.

bandwidth-limited operation

In fiber optics, the limitation on performance imposed by the system bandwidth rather than the amplitude of the signal.

bar

barometer

barcode scanner

An optical scanning device designed to read information printed in the form of bars of different size by detection and processing of the varying reflectivity of light in the barcode.

Bardeen-Cooper-Schrieffer theory -> BCS theory

Bardeen-Cooper-Schrieffer theory of superconductivity, based on the notion that electrons with opposite momentum and spin are paired as a result of forces arising from lattice vibrations. The theory...

barium fluoride

A relatively hard crystal, highly resistant to excessive energy radiation, that is frequently used for optical windows, prisms and lenses transmitting from the vacuum UV into the IR.

barium titanate

A crystalline material used in piezoelectric devices.

Barlow lens

A negative lens used to increase the effective focal length of a telescope objective.

barrel -> adapter (optical adapter)

An optical adapter typically refers to a device or component used in optical systems to facilitate connections between different types of optical fibers, connectors, or interfaces. Here are a few...

barrel distortion

The negative distortion that causes a square grid pattern to be imaged as barrel-shaped.

barrier layer

In the fabrication of an optical fiber, a layer that can be used to create a boundary against OH-ion diffusion into the core.

baryta -> glass barium

A type of glass containing barium oxide, which is added to increase the refractive index while maintaining a relatively low dispersion.

basal plane

A plane in a crystal that lies parallel to the principal plane of symmetry.

base-altitude ratio

In aerial photography, the ratio derived from a stereoscopic pair of photographs that represents the air-base length divided by the flight altitude.

baseband

The simplest method of transmission on a local area network. The entire bandwidth of the cable is used to transmit a single unmodulated digital signal. Baseband transmission is capable of...

baseband response function -> transfer function

The complex function, H(f), equal to the ratio of the output to input of the device as a function of frequency. The amplitude and phase responses are, respectively, the magnitude of H(f) and the...

baselength

The distance between pupil centers in a two-pupil system, measured perpendicularly to the optic axis.

baseline

The smallest amount of photon energy to pass a detector window and be counted.

basic roughness

The roughness profile shape from which light scattering is expected to occur.

bathymetric lidar

Bathymetric lidar is a remote sensing technique used to measure the depth of water bodies and map underwater terrain features. It employs lidar (Light Detection and Ranging) technology, which uses...

bathymetric map

A surveying map representing measurement of depth, particularly that of the ocean.

baud

A unit of speed of transmission or receipt of a signal, roughly equal to bits per second; common baud rates are 300, 1200, 2400, 4800 and 9600.

Baume scale

The scale for floating hydrometers used to measure the specific gravity of a polishing suspension. The depth of immersion is a linear function of the inverse of the density. The Baume scale is linear...

BAW

bulk acoustic wave

bay

In optical character recognition, a feature at the boundary of a character.

bayonet coupling

A coupling mechanism designed to quickly lock a connector into an adaptor or a lens into a lens mount. Typically coupling is accomplished by less than a quarter turn of the component being mounted.

BBAR

broadband antireflection

BBM

broadband mirror

BBO

beta-barium borate

BCD

binary coded decimal

BCS theory

baud

BDS

beam-delivery system

Baume

beacon

A device, either visual or electronic, that emits signals to identify set positions for use in the navigation of aircraft and ships along flight paths and channels, or as a warning against entering a...

beaconage

A system of beacons used in navigation.

beam

1. A bundle of light rays that may be parallel, converging or diverging. 2. A concentrated, unidirectional stream of particles. 3. A concentrated, unidirectional flow of electromagnetic waves.

beam attenuator

A device designed to decrease flux density or power per unit area of a light beam through absorption and scattering of the beam.

beam bender

A mirror used to manipulate the beam in a laser system.

beam candlepower

With relation to the equivalent beam candlepower of a searchlight, the candlepower of a bare source that would produce the same illumination at the respective point if located the same distance away.

beam converter

A device used to alter the shape of or energy distribution within a beam of radiation.

beam deflection tube

An electron-beam tube in which the current to an output electrode is regulated by the transverse motion of the tube's electron beam.

beam diameter

1. Calculated distance between two exactly opposed points on a beam at a chosen fraction of peak power (typically 1/e2). 2. The diameter of a circular aperture that will pass a specified percentage...

beam divergence

Increase in the diameter of an initially collimated beam, as measured in milliradians (mrad) at specified points; i.e., where irradiance is a given fraction (often 1/e2) of peak irradiance.

beam divider -> beamsplitter

A beamsplitter is an optical device used to divide a beam of light into two or more separate beams, typically by reflecting a portion of the incident light while transmitting the remainder....

beam expander

A system of optical components designed to increase the diameter of a radiation beam. Usually an afocal system.

beam matrix

1. A geometrical arrangement of two or more light beams for use in laser shows, object detection or other applications requiring arrayed multiple beams. 2. A mathematical 2 X 2 or 3 X 3 matrix for...

Photonics Dictionary

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