Definitions: P

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paraxial

Characteristic of optical analyses that are limited to infinitesimally small apertures. Also called first-order or Gaussian optics.

perovskite

The term perovskite refers to a specific crystal structure commonly found in various materials. Perovskite structures have a cubic arrangement of oxygen ions, forming a framework within which other...

photolysis flash -> spectroscopic flash

The light flash, produced in flash photolysis, that is triggered within a second discharge tube by the third electrode. It is to be differentiated from the photolysis flash which is triggered within...

photonics contract manufacturing

Photonics contract manufacturing refers to the outsourcing of the production of photonics-related components, devices, or systems to specialized manufacturing firms. Photonics involves the...

piezo worm

A piezoelectric translator that moves up and down a spindle like a caterpillar. It clamps itself at one end, expands, clamps the other end, releases the first end, and then contracts and begins the...

plane-parallel plate -> window

1. A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture. 2. A particular region of the electromagnetic spectrum that has been...

plano lens -> window

1. A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture. 2. A particular region of the electromagnetic spectrum that has been...

polyethylene

A material used to jacket fiber optic cables. It is chemical- and moisture-resistant, but not fire-resistant.

Porro prism erecting system

The arrangement of two Porro prisms so that the inverted image formed by certain types of optical instruments is the same as the object. The first prism, which is set at 90° to the second, inverts...

primary spectrum

The first-order spectrum formed by a diffraction grating.

Photonics DictionaryDefinitionsP

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