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17 terms
Photonics Dictionary: F
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FIR x
F x
FIR
full indicator reading; far-infrared
fire cracks
Small clefts or fissures that penetrate the glass surface in the form of short-hooked crescents. Fire cracks result from a sudden excessive change in temperature.
first principal point
The principal point of a lens relative to the object space.
first window
The spectral transmission window in silica-based fibers between 830 and 850 nm.
first-order optics
->
Gaussian optics
1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...
first-order spectrum
The separate spectral lines formed by a diffraction grating that are characterized by one wavelength difference in path length between adjacent slits.
first-order theory
->
Gaussian optics
1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...
first-side meniscus
The process of grinding the concave surface of a single-vision spherical lens.
first-side toric
The process of grinding the toric surface of a single vision sphero-cylindrical lens.
first-surface mirror
->
front-surface mirror
An optical reflector with the reflective coating applied to the front surface of the substrate. This eliminates the ghost image formed with second-surface mirrors.
FIRT
far-infrared transmission
far-infrared grating
A grating with very coarse rulings to match the long wavelengths in the far-infrared region. In the most efficient ruling method, grooves are cut in plane, solid aluminum alloy blanks.
far-infrared laser
A laser with output over a wide range of wavelengths spanning the far-infrared region of the spectrum (30 to 1000 µm); typically, it consists of a metal or dielectric waveguide one to two...
far-infrared maser
A gas maser that is capable of producing radiation in the far-infrared region of the spectrum.
far-infrared
That part of the infrared spectrum from about 30 to 1000 µm.
FIFO
first in/first out
Förster resonance energy transfer
Förster resonance energy transfer (FRET) is a mechanism describing the transfer of energy between two closely spaced fluorescent molecules. This phenomenon is named after the German scientist...
Photonics Dictionary
F
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