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Photonics Dictionary: P

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parfocal
Having coincident focal points.
parfocal eyepiece
One eyepiece of a set having equal distances from their mounting interface to their image plane, permitting freedom to interchange eyepieces without the need to refocus.
parfocal lenses
Lenses that have identical flange focal distances and can be interchanged.
parity
In data transmission, a self-checking code using a separate bit (the parity bit) to assure that all bytes of transmitted data contain either an odd or an even number of bits. Upon receipt, the data...
partial coherence theory
Totally coherent radiation is produced by a purely monochromatic point source. In the real world the energy will have a limited bandwidth and the point source will subtend some angle resulting in...
particle acceleration
Particle acceleration refers to the process by which charged particles, such as electrons or protons, gain kinetic energy and increase their velocity. This acceleration can occur in various natural...
particle image velocimetry
A whole-flow-field technique providing instantaneous velocity vector measurements in a cross-section of a flow that is seeded with micron-sized particles. CCD or CMOS cameras and laser light sheets...
PAS
photoacoustic spectroscopy
pascal
The pressure or stress of one newton per square meter.
Paschen series
An array of lines in the infrared region of the emission spectrum of atomic hydrogen. Their wave numbers are expressed by the equation: where represents the wave number in the reciprocal centimeters,...
Paschen-Runge mounting
A mounting used for large concave gratings, whereby the slit, grating and plate holder lie in the Rowland circle, and the photographic plates lie along a large portion of the circle. In this way, a...
passband -> bandpass
The range of frequencies that will pass through a filter or other device. Synonymous with passband.
passive optical component
A device that responds to incident light but does not generate light.
passive optical network
A passive optical network (PON) is a telecommunications network architecture that uses optical fibers and passive optical components to provide high-speed broadband services to end-users. In a PON...
passive-matrix liquid crystal display
An LCD that has pixels with no internal drive transistors.
passive-matrix OLED display
An OLED display formed by creating an array of OLED pixels connected by intersecting anode and cathode conductors arranged in rows and columns. Electrical power is passed through selected pixels by...
PAT
pointing, acquisition and tracking
path length -> optical path length
In a medium of constant refractive index, the product of the geometrical distance and the refractive index.
path-reversal principle
The criterion maintaining that if light follows a specific path through an optical system, it will, if reversed, traverse that same path in the opposite direction.
pathogen
A pathogen is a biological agent, such as a virus, bacterium, fungus, protozoan, or parasite, that causes disease in its host organism. Pathogens have the capability to invade host tissues,...
patina
A thin film or coating that forms on various finished surfaces. On optical surfaces it usually denotes aging.
pattern
A device that determines the lens shape in the cutting or edging phase of fabrication. It also is used to denote the arrangement of markings on a reticle.
Pauli exclusion principle
The number of electrons that can share a principal quantum number by preventing identity between any two electrons' four quantum numbers, thereby permitting the periodic arrangement of the elements.
PB
proton bombardment
PBC
polarization beam combiner
PBX
private branch exchange
PC
photoconductive; printed circuit; personal computer
PCA
photoconductive antenna
PCAOM
polychromatic acousto-optic modulator
PCD
plasma-coupled device
PCE
phase-change erasable
PCF
photonic crystal fiber
PCI
peripheral component interconnect
PCM
pulse code modulation; phase-conjugate mirror
PCMI
photochromic microimage
PCP
plastic-clad plastic
PCR
photoconductive relay; polymerase chain reaction
PCS
plastic-clad silica; photon correlation spectroscopy
PCT
photon-coupled transistor
PCVD
plasma chemical vapor deposition
PD
perfect diffuser
PDA
photodiode array; postdeflection acceleration
PDCR
polarization-dependent coupling ratio
PDG
polarization-dependent gain
PDIO
photodiode
PDK
phase-delay keying
PDL
polarization-dependent loss
pdl
poundal
PDLC
polymer dispersed liquid crystals
PDM
pulse duration modulation

Photonics DictionaryP

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