Hamamatsu Corp. - Mid-Infrared LED 11/24 LB

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PI Physik Instrumente - Microscope Stages MR ROS 11/24

8,726 terms

Photonics Dictionary

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

photoconductive thermoplastic

PTF

pulse transfer function

PTK

phototherapeutic keratectomy

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

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...

peak-to-valley

photovoltaic

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Photonics Dictionary

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