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8,289 terms
Photonics Dictionary
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ns x
PSD
position-sensing detector; pseudo-second derivative
PSE
power spectrum equalization
pseudo-second-derivative
A method used to approximate the values of the homogeneous second derivatives at each iteration in the course of lens design and that excels the rate of convergence of the damped least squares method...
pseudocolor
In image processing, generating a color image from monochrome data by assigning a color to each of the gray levels.
pseudohologram
Coded image obtained optically with a nonredundant pinhole array imaging aperture.
pseudoscopic image
An image that is reversed contour or inside-out.
PSF
point spread function
psi
pounds per square inch
psia
pounds per square inch absolute
psig
pounds per square inch gauge
PSK
phase-shift keying
PSTM
photon scanning tunneling microscope
PT
photoconductive thermoplastic
PTF
pulse transfer function
PTM
photon tunneling microscope; pulse transmission mode
PTO
public telecommunications operator
PTT
post, telephone and telegraph
pulsar
An astronomical body that emits radiation concentrated by a strong magnetic field into two beams that rotate, giving a pulsing effect.
pulse amplification
The compression and intensification of a laser pulse of a specific width into a smaller pulse width. A spherical cavity, in conjunction with a beam compressor, is efficient for pulse amplification....
pulse analyzer
The instrument used to analyze a pulsed electromagnetic wave to determine its time, amplitude, duration and shape, and to display this information in some appropriate form, either visually or...
pulse code modulation
System of information coding in which the signal is sampled 8000 times per second and the samples quantized by referring them to a series of preset 8-bit codes. Thus digitized, the signal is sent to...
pulse compression
A means of achieving higher peak powers and more efficient harmonic generation by narrowing the pulse width and thus increasing the frequency bandwidth of the output of CW mode-locked lasers....
pulse counter detector
A device designed to detect frequency-modulated signals by forming a unidirectional pulse from each sine wave. The direct current of the pulse is proportional to the frequency of the...
pulse duration
The lifetime of a laser pulse, generally defined as the time interval between the halfpower points on the leading and trailing edges of the pulse.
pulse energy thermography
->
pulse video thermography
A noncontact, nondestructive method of measuring defects in thin composite materials, using a xenon flashtube to generate heat in a sample. A thermal imaging system detects differences in the rates...
pulse forming network
A series of capacitors and inductors connected to the flashlamp in a pumped Nd:YAG laser system in order to regulate the pulse shape of the current delivered to the lamp at a given operating voltage.
pulse reduction factor
Factor that relates the pulse spread occurring in a graded-index fiber to that of an equivalent step-index fiber having an identical refractive index difference between core and cladding (that is, an...
pulse repetition frequency
Number of pulses emitted per unit of time by a pulsed laser.
pulse shaping
The use of variations in the power supplied to a laser to change the shape of the output pulse. The technique is used in laser welding, for example, to condition a surface by preheating it at a low...
pulse slicer
An instrument designed for laser technology that is used to extract single pulses from the laser and transmit a portion of the pulses, thereby reducing the pulse rate to a desirable frequency.
pulse spreading
Variations in a signal passing through an optical fiber caused by the effect on the pulse of the fiber's material and mode propagation characteristics.
pulse video thermography
A noncontact, nondestructive method of measuring defects in thin composite materials, using a xenon flashtube to generate heat in a sample. A thermal imaging system detects differences in the rates...
pulse width
The interval of duration of a pulse.
pulsed laser
A laser that emits energy in a series of short bursts or pulses and that remains inactive between each burst or pulse. The frequency of the pulses is termed the pulse-repetition frequency.
pulsed laser deposition
A technique for depositing a material coating on metal, ceramic, semiconductor or polymer substrates. The interaction of laser energy with the target creates a plume of ablated material that is...
pulsed radiance
The integral of the radiance over exposure time.
pulsed sandwich holography
Separation of incident laser pulses by several seconds so holographic plates can be changed and sandwiched between the pulses. This technique combines the short exposure time of pulsed holography...
pulsed welding
A type of laser welding that produces short-duration vapor pockets without buildup of heat in the part, useful for parts that are too thick for conduction welding and that move too slowly for keyhole...
pulsed-dye laser
A laser with a gain medium consisting of an organic dye, which is carbon-based. The dye is mixed with a solvent, allowing the molecules to diffuse evenly throughout the liquid. The dye medium is...
pump laser
A pump laser is a type of laser used to provide the necessary energy to the gain medium of another laser or laser system, initiating the process of stimulated emission and producing laser light. The...
pumping band
A group of energy levels to which ions in the ground state are initially excited when pumping radiation is applied to a laser medium. The pumping band usually lies higher in energy than the levels...
pumping radiation
Radiation used to excite an optical or laser material to a higher energy level. See optical pumping.
pupil
1. In the eye, the opening in the iris that permits light to pass and be focused on the retina. 2. In a lens, the image of the aperture stop as seen from object and image space.
pupilometer
An instrument for measuring the diameter of the human eye pupil.
purity, colorimetric
->
colorimetric purity
Ratio, to the luminance of a test color, of the luminance of the spectrum color that matches the test color when mixed with white light.
purity, excitation
->
excitation purity
On the CIE chromaticity diagram, the distance from the achromatic point to the sample point, divided by the distance from the achromatic point through the sample point to the spectrum locus or purple...
pushbroom scanning
Pushbroom scanning is a technique used in remote sensing and imaging systems, particularly in satellite and aerial sensors, to capture images of the Earth's surface or other objects. In pushbroom...
PVC
polyvinyl chloride
PVD
physical vapor deposition
PVS
programmable vision systems
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Photonics Dictionary
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