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Photonics Dictionary: R
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Raman fiber probe
A flexible fiber cable with a small diameter that transports light from the excitation laser to the target. Used in Raman spectroscopy, the probe is capable of obtaining high-quality data at high...
rare earth dopants
Rare earth dopants refer to elements from the lanthanide series, also known as rare earth elements, that are intentionally introduced into the crystal lattice of a material to modify its properties....
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 the glass core matrix, yielding high absorption with low loss in the visible...
rare-earth elements
Rare-earth elements (REEs) are a group of seventeen chemical elements found in the Earth's crust, characterized by their unique properties and scarcity relative to other elements. Despite their name,...
registration shift
A shift in the apparent position of an object when an optical element is added or removed.
replicated optics
Optical components, usually reflectors, produced using proprietary techniques that transfer the precision of a master to a number of elements.
retardation plate
->
wave plate
An optical element having two principal axes, slow and fast, that resolve an incident polarized beam into two mutually perpendicular polarized beams. The emerging beam recombines to form a particular...
retroreflection
Retroreflection is a phenomenon in optics where light is reflected back toward its source, typically in a direction nearly parallel to the direction from which it originated. This occurs due to the...
ring blocking
The formation of a block by attaching optical elements to a plate with a ring of pitch or other thermoplastic material.
rotating hologram
A disc composed of a series of holographic optical elements that diffract light at various angles. When spinning, a raster scan may be generated.
Photonics Dictionary
R
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