Meadowlark Optics - Wave Plates 6/24 LB 2024

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Ohara Corp. - Optical Glass, Polish substrates 10-23

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

8,726 terms

Photonics Dictionary

channel impedance

The parallel resistance and capacitance appearing between the active guard ring junctions in a silicon photodiode.

channel substrate planar growth

The creation of a diode laser structure by liquid-phase epitaxy over a grooved substrate.

character generation cathode-ray tube

A cathode-ray tube that generates symbols for use in other displays. The tube operates by scanning specific characters on the target and generating them as video signals to other cathode-ray systems.

character generator

Computer hardware or firmware that accesses character patterns stored in read-only memory and displays them at specific coordinates on a screen.

character read-out system

A photoelectrically controlled, alphanumeric reading device that converts characters to audible or sorting signals which can be fed to a computer, electric typewriter, tapepunch or other machine.

characteristic angle

The angle at which a given mode propagates down an optical fiber.

characteristic curve

A graph used in photography to portray the increase of a film's density as its time of exposure increases.

charge packet -> packet

The finite amount of electrical charge generated in response to incident radiation and transferred from one storage element to the next in a charge-coupled device. Each packet corresponds to a pixel...

charge trapping

In a charge-coupled device, the disappearance of some of the accumulated charge into the silicon during readout.

charge-coupled device

A charge-coupled device (CCD) is a type of electronic image sensor used in various imaging devices, including digital cameras, camcorders, and scientific instruments. It consists of an integrated...

charge-injection device

A charge-injection device (CID) refers to a class of devices that manipulate and detect electrical charge within a semiconductor material. Charge-coupled devices are a specific implementation of this...

charge-transfer device

See charge-coupled device; charge-injection device.

charge-transfer efficiency

In a charge-coupled device, the percentage of each charge packet that is carried over to the next stage of the transport shift register.

charge-transfer gate -> transfer gate

A single long gate electrode that transfers the line of charge packets to the transport shift register in a charge-coupled device.

chelate laser

A laser having a rare-earth chelate within a plastic host as the lasing material. The chelate laser is easily pumped and has a high quantum efficiency and narrow emission lines.

chelating agent

Any of several compounds capable of binding heavy-metal ions, thereby preventing interaction between the bound ions and the rest of the medium.

chemical actinometer

A light-sensitive detector having a chemical compound that reacts when exposed to light. It is used in photochemistry and relies on the chemical reaction to determine the amount of incident radiation.

chemical laser

A laser that relies on chemical activity instead of electrical energy to produce the pumping action necessary to form pulses of light.

chemical microscopy

The field of microscopy as applied to chemical problems and analysis.

chemical sensing

Chemical sensing refers to the detection and measurement of specific chemical compounds or substances in various environments or samples. It involves the use of sensors or analytical techniques to...

chemical vapor deposition equipment

Chemical vapor deposition (CVD) equipment refers to a class of specialized apparatus used in the process of chemical vapor deposition, a technique for depositing thin films of various materials onto...

chemical vapor deposition

Chemical vapor deposition is a process of applying dopants to a glass bait by flame reactions of gaseous compounds. See also outside vapor-phase oxidation; inside vapor-phase oxidation.

chemical-mechanical polishing

A technique for polishing silicon in which an alkaline suspension containing silicon dioxide particles creates a soft layer of silicon hydroxide, which is then removed, leaving a surface with the...

chemiluminescence

A chemical reaction involving the production of light. The reaction of ethylene with ozone is chemiluminescent.

chemisorption

The binding of gas to a surface or in matter by chemical activity.

chemosphere

Also known as mesosphere. A level of the atmosphere, extending from the stratosphere to the ionosphere, that is noted for its photochemical activity.

chief ray

The ray that passes through the center of the aperture stop in an optical system. It often is called the principal ray of an oblique beam.

chip

1. A localized fracture at the end of a cleaved optical fiber or on a glass surface. 2. An integrated circuit.

CHIP

chain input pointing

chip-on-board lights

Chip-on-board (COB) lights refer to a type of LED lighting technology where multiple LED chips are directly mounted onto a substrate, typically a printed circuit board (PCB), without the need for...

chipping -> cribbing

The breaking of the excess glass from the specified shape.

chiral

Description of a particle that cannot be superimposed on its mirror image.

chirality

Chirality is a property of certain molecules and objects in which they are non-superimposable on their mirror images. In other words, a chiral object or molecule cannot be exactly superimposed onto...

chirped mirrors

Chirped mirrors are optical devices designed to manipulate the spectral properties of ultrashort laser pulses. They consist of multiple layers of dielectric coatings deposited on a substrate, where...

chirped-pulse amplification laser

A laser whose pulses are expanded, using gratings and optical fibers, before amplification and compressed to increase beam intensity without damage to the optical train.

chirped-pulse amplification

Chirped pulse amplification (CPA) is a technique used in laser physics to amplify ultrashort laser pulses to high energies without causing damage to the amplifying medium. The method was first...

chirping

A rapid change, as opposed to a long-term drift, of the emission wavelength of an optical source. Chirping is most often observed in pulsed operation of a source.

choledochoscope

A small fiber optic endoscope used in laser surgery.

cholesteric phase

The state of a liquid crystal in which the molecules are arranged in layers with their long axes in the plane of each layer. The alignment in each layer is parallel and the alignment in adjacent...

chopper -> optical chopper

A mechanical or electrical-electromagnetic device for periodically interrupting or blocking abeam of light for a brief known interval. The three most common chopper types include the tuning fork...

chopping frequency -> modulation frequency

Rate at which optical radiation or a signal is varied through the use of a mechanical or electronic chopper. Also called chopping frequency.

Christiansen effect

The monochromatic transparency effect produced by the immersion of a finely powdered substance (e.g., glass or quartz) into a liquid with a similar refractive index.

Christiansen-effect filter

A transparent powdered solid immersed in a liquid or plastic of similar refractive index but widely different dispersion; used to isolate narrow spectral regions.

chroma

1. Attribute of a visual sensation that permits a judgment to be made of the amount of pure chromatic color present. 2. The portion of a composite video signal that carries the chrominance values,...

chromascope

An instrument designed to analyze the optical effects of color.

chromatic

Having the property of color.

chromatic aberration

Chromatic aberration is an optical phenomenon that occurs when different wavelengths (colors) of light are refracted by a lens or optical system, leading to a failure to focus all colors to the same...

chromatic adaptation

Change of sensitivity of the eye leading to changed color perception.

chromatic difference of magnification -> chromatic aberration

chromatic dispersion -> dispersion

Dispersion refers to the phenomenon where different wavelengths (colors) of light travel at different speeds when passing through a medium. This variation in the speed of light for different colors...

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