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21 terms

Photonics Dictionary: B

Clear All Filters x glasses x B x
Babinet compensator

A device containing two opposed quartz wedges of equal angle, one wedge being movable along its length by a micrometer screw. The wedges are cut so that their fast directions are along, and...

back-coated mirror

A glass substrate that has its rear surface coated with a reflective coating. Also known as a back-surface mirror.

back-surface mirror -> back-coated mirror

A glass substrate that has its rear surface coated with a reflective coating. Also known as a back-surface mirror.

ball lens

A ball lens is a small, spherical optical component typically made of glass or other transparent materials. It is characterized by its spherical shape, with both its front and back surfaces forming...

baryta -> glass barium

A type of glass containing barium oxide, which is added to increase the refractive index while maintaining a relatively low dispersion.

beam-addressable technology

The application of reversible writing with a laser beam on particular storage materials. In one method, an amorphous film is heated and then crystallized for writing. Bubble writing involves the...

beamsplitting block

A glass block that produces stationary fringes in the region crossed by incident light beams.

Becke apertometer

Device used to measure the numerical aperture of a microscope, composed of a 14-mm-thick glass block with numerical aperture gradations carved onto its lower surface.

bench -> optical bench

A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to the others, and a number of sliders equipped with holders for lenses, lamps,...

bifocal lens

A two-part lens that has a different focal length for each part. Generally, it is used in eyeglasses to correct for both near and far vision.

biprism

A piece of glass polished flat on one side, with a pair of polished faces that form an angle close to 180° on the other side, the dividing edge running down the middle of the plate. It is used...

borosilicate crown glass

blacking -> optical blacking

A light absorbing material applied to ground optical surfaces during the process of making that surface non reflective. Such material should have a refractive index as high as that of the underlying...

blank

A piece of glass, quartz or other transparent material formed roughly by molding or cutting into the approximate shape and size of the finished part.

blister

An extended bubble or seed on glass, elliptically shaped and more than one-quarter inch (6.3 mm) in length.

body

In the optical field, a piece of glass to which a lens or prism is cemented. The unit is ground and polished as a whole to obtain a sharp edge on the finished piece.

borosilicate glass

A strong, heat-resistant glass that contains a minimum of 5 percent boric oxide.

Brewster angle window

A parallel plate of glass in such a position that the refracted and reflected rays of incident parallel light are mutually perpendicular. In this situation the reflected light is plane polarized, and...

bubble writing -> beam-addressable technology

The application of reversible writing with a laser beam on particular storage materials. In one method, an amorphous film is heated and then crystallized for writing. Bubble writing involves the...

burning glass

A convex lens that brings an incident bundle of rays to a focus to produce intense heat at the focus.

button

A piece of glass with a high refractive index that is fused to the major blank.

Photonics DictionaryB

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