A Lyot
stop (also called a glare stop) is an optical
stop
Stop may refer to:
Places
* Stop, Kentucky, an unincorporated community in the United States
* Stop (Rogatica), a village in Rogatica, Republika Srpska, Bosnia and Herzegovina
Facilities
* Bus stop
* Truck stop, a type of rest stop for truck d ...
, invented by French astronomer
Bernard Lyot
Bernard Ferdinand Lyot (27 February 1897 in Paris – 2 April 1952 in Cairo) was a French astronomer.
Biography
An avid reader of the works of Camille Flammarion, he became a member of the Société Astronomique de France in 1915 and made h ...
, that reduces the amount of
flare
A flare, also sometimes called a fusée, fusee, or bengala in some Latin-speaking countries, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, ...
caused by
diffraction
Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a s ...
of other stops and baffles in
optical system
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviole ...
s.
Lyot stops are located at images of the system's
entrance pupil
In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front (the object side) of the lens system. The corresponding image of the aperture as seen through the back of the lens system is ...
and have a diameter slightly smaller than the pupil's image. Examples of applications can be found in Ref.
See also
*
Lyot filter
A Lyot filter, named for its inventor Bernard Lyot, is a type of optical filter that uses birefringence to produce a narrow passband of transmitted wavelengths. Lyot filters are often used in astronomy, particularly for solar astronomy.
A Lyot fi ...
*
Lyot depolarizer A depolarizer or depolariser is an optical device used to scramble the polarization of light. An ideal depolarizer would output randomly polarized light whatever its input, but all practical depolarizers produce pseudo-random output polarization.
O ...
*
Coronagraph
A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects – which otherwise would be hidden in the star's bright glare – can be resolved. Most coronagraphs are intended to view ...
References
External links
NASA Coronagraphs''Handbook of Optics''
by Bass et al.
Optical devices
Photography equipment
{{Optics-stub