Photonics Dictionary: F

Clear All Filters x 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 DictionaryF

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