Photonics Dictionary: R

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current x

R x

radio-frequency light source

A very uncommon lamp in which a tungsten electrode is heated to incandescence by a radio-frequency electrical current.

relative intensity noise

The inherent laser amplitude noise relative to the average optical power produced by the laser; the RIN decreases rapidly as current is increased.

remote sensing

Remote sensing is a method of data collection and observation where information about objects, areas, or phenomena on Earth's surface is gathered from a distance, typically using sensors onboard...

resistance heater

A crucible made of electrically resistive material through which a current is passed to heat the material inside, which then evaporates and is deposited as a thin film on a substrate. Resistance...

resistor

A device having electrical resistance and used in an electric current for purposes of protection, operation or control of current.

responsive element -> active element

In various fields of science and technology, an active element typically refers to a component or substance that actively participates in or facilitates a process, operation, or reaction. Here are...

responsivity

The gain that occurs between light intensity incident on a CCD given by the photocurrent produced.

reverse bias

Voltage that produces current flow in the direction of greater resistance to the steady-state direct current; i.e., from the cathode to the anode.

rise time

Measurement of the time elapsed during the current output change from 10 to 90 percent in a photoconductor.

Rogovsky coil

Conductor element for use in integrated electro-optic systems that measures current flowing through it.

Photonics DictionaryR

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