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Zurich Instruments AG - Lock-In Amplifiers 4/24 LB
core Dictionary Terms

leaky ray
In an optical waveguide, a ray for which geometric optics would predict total internal reflection at the core boundary, but...
liquid marble
Liquid marble refers to a unique form of microscale liquid encapsulation, where small droplets of liquid are coated with a...
linear positioning stage
A linear positioning stage, also known as a linear stage or translation stage, is a precision mechanical device used to...
adaptive optics
Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effects of...
antiguide
A waveguide that has a core with a lower refractive index than the refractive index of the cladding. This structure can...
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...
guided ray
In an optical waveguide, a ray that is completely confined to the core.
inertial confinement fusion
Inertial confinement fusion (ICF) is a method of achieving nuclear fusion, a process where two atomic nuclei combine to...
carbon arc
An electric discharge between two carbon rods that are touched together to start the arc and then separated slightly. The...
deeply depressed cladding fiber
An optical fiber, usually a single-mode fiber, that has an outer cladding with nearly the same index of refraction as the...
all-silica fiber
Also known as all-glass fiber. A fiber with both a silica core and a silica cladding, regardless of the presence of a...
step index fiber
An optical fiber in which the core is of uniform refractive index.
fiber-coupled LED
A fiber-coupled LED (light-emitting diode) refers to an LED device that is optically coupled to an optical fiber for the...
double-clad fiber
Double-clad fiber (DCF) is a specialized optical fiber that features two concentric cladding layers surrounding a core. The...
graded index
Descriptive of an optical fiber having a core refractive index that decreases almost parabolically and radially outward...
projecting core coupler
A device that couples a light source to an optical fiber by projecting an image of the source and the fiber core onto a...
liquid lightguide
An optical fiber with a hollow core filled with a liquid material that has a higher refractive index than the solid...
fiber Bragg grating
A fiber Bragg grating (FBG) is a type of optical filter that is inscribed or "written" into the core of an optical fiber. It...
double-crucible method
A method of fabricating an optical waveguide by melting the core and clad glasses in two suitably joined concentric...
core-coupled lens
A semispherical or conical lens created directly on the core of an optical fiber to focus light from a laser into the fiber...
fiber lapping
A method of optical fiber coupling in which the fibers are ground down to expose their cores and placed together to allow...
electro-optic modulator
An electro-optic modulator (EOM) is a device used to modulate the amplitude, phase, or polarization of light waves using an...
hard-clad silica fiber
A type of optical fiber in which a silica core is surrounded by a hard polymer or similar material much stronger than the...
fiber laser
A fiber laser is a type of laser in which the active gain medium is an optical fiber doped with rare-earth ions such as...
barrier layer
In the fabrication of an optical fiber, a layer that can be used to create a boundary against OH-ion diffusion into the core.
large-core fiber
Optical fiber with a large core, often a step-index fiber; "large'' is at times defined as greater than 85 µm.
elasto-optic effect
A change in the refractive index of an optical fiber caused by variation in the length of the fiber core in response to...
machine vision system
A machine vision system is an integrated combination of hardware and software components designed to capture, process, and...
index-matching material
A material, often a liquid or cement, whose refractive index is nearly equal to the fiber's core index, used to reduce...
refracted ray
A light ray that has had its direction altered because of its traversing an air-to-glass interface at some angle. In an...
plastic optical fiber
Plastic optical fiber (POF) is a type of optical fiber made from transparent plastic, typically polymethylmethacrylate...
tolerance field
In fiber optics, the annular region between two concentric circles; used to specify fiber cladding and core sizes.
fiber axis
The mechanical centerline through the core of an optical fiber.
aureole
The indistinct, less luminous portion lying immediately outside an electric arc whose spectrum often differs from that of...
ionic focusing
Also known as gas focusing. The introduction of an inert gas into a cathode-ray tube for the concentration of the electron...
cladding glass
In fiber optics, the glass that is found around the glass core of the fiber, and that has a lower refractive index than the...
attosecond photonics sources
Attosecond photonics sources refer to devices or systems that generate extremely short pulses of light on the order of...
erbium-doped fiber amplifier
An optical fiber that can be used to amplify an optical input. Erbium rare earth ions are added to the fiber core material...
packing fraction
The ratio of the active core area of a fiber bundle to the total area at its light-emitting or receiving end.
honeycomb table
An optical test table made up of two outer layers or "skins'' bonded to either side of a honeycomblike core, usually of...
fiber fuse
A phenomenon in which high optical power, encountering an imperfection in an optical fiber, destroys the fiber's core and...
laser diode module
A laser diode module is a compact device that incorporates a laser diode, optics, and often other components into a single...
optical fiber
Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light...
concentricity error
The distance between the center of the two concentric circles of an optical fiber that designate the diameter of the...
plastic fiber
Fiber in which both core and cladding are made of plastic.
plastic jackets
The direct cladding used for fused silica cores to create large numerical aperture fibers and used as overcoats to...
plastic-clad silica fiber
An optical waveguide having a silica core and a plastic cladding.
refractive index contrast
A measure of the relative difference in refractive index between two optical materials. Most commonly used in fiber optics...
automatic profiling
In fiber optics, the use of a detector to study the range of refractive indices achieved at various wavelengths. This...
guided mode
In an optical waveguide, a mode whose field decays monotonically in the transverse direction everywhere external to the core...
index dip
The decrease in the refractive index at the center of a fiber's core, caused by certain fabrication techniques. Also called...
rare-earth doped fiber
An optical fiber in which ions of a rare-earth element, such as neodymium, erbium or holmium, have been incorporated into...
stripper
A tool used to remove the outer cladding of an optical fiber without damaging the fiber core.
grating beamsplitter
A grating beamsplitter is an optical device that utilizes the principles of diffraction to split a beam of light into...
hollow waveguide
An infrared-transmitting optical fiber with a hollow core; it can be square, round or rectangular in cross section. Capable...
stress-applying part
In polarization-preserving optical fibers, the element used to induce birefringence. The SAP is highly doped to provide a...
cladding
The low-refractive-index material that surrounds the core of an optical fiber to contain core light while protecting against...
overfill
The condition of the numerical aperture or beam diameter of the laser, LED, or other optical source being larger than the...
fiber optic gyroscope
A fiber optic gyroscope (FOG) is a type of gyroscope that uses the interference of light waves to detect changes in...
self-absorption
In optical emission spectroscopy, the reduction in radiant power in the central portion of spectral lines arising from the...
liquid core optical fiber
Multimode straight fiber capable of transporting linearly polarized light with any incident polarization angle, and in which...
packing density
1. In a photonic interconnect, the number of detectors in a given area. Detectors spaced too closely may give rise to...
cladding ray
A ray that is reflected into the core of an optical fiber from the outer surface of the cladding.
core
The light-conducting portion of an optical fiber, defined by the region of high refractive index.
reference surface
The surface of an optical fiber that is used as a reference when joining optical fibers. Although the outermost cladding is...
microbend-modulated sensor
A type of fiber optic sensor that detects changes in pressure, vibration, sound level or acceleration by monitoring the...
fiber optic cable assembly
A fiber optic cable assembly refers to a complete unit consisting of optical fibers, connectors, protective jackets, and...
step index profile
A profile of an optical component, usually a fiber, in which the core is of uniform refractive index and the cladding or...
generating mark
The curved mark formed when, in the process of generating, a loose or coarse diamond particle from the generating tool...
normalized frequency
Also referred to as the V number in fiber optics; the normalized frequency is a dimensionless quantity, denoted by the...
intrinsic joint loss
Loss intrinsic to the fiber caused by parameter (core dimension, profile parameter) mismatches when two nonidentical fibers...
connector loss
Energy loss encountered at connectors in optical fiber transmission systems. The major contributors are mutual core...
inertial fusion energy
Inertial fusion energy (IFE) refers to a proposed method of generating electricity by harnessing the energy released from...
fiber optic preform
A fiber optic preform is a cylindrical glass rod or tube used as the starting material for manufacturing optical fibers. It...

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