Photonics Dictionary

A lens or mirror surface that is perfectly flat.

A lens with one plane surface and one concave surface.

A lens that has one plane surface and one convex surface.

A piece of glass having a crude plano surface on each side.

In plano work, that property of a surface determining that it is convex and contacts a flat test glass at its center.

An ocular having two planoconvex lenses that are formed from similar glass and that are separated by a space equal to half the sum of their focal lengths. This eyepiece is free of lateral chromatic...

An eyepiece consisting of a planoconvex field lens and a cemented doublet as the eye lens.

Laser optics refers to a broad category of optical components and systems designed for manipulating and controlling laser light. Laser optics play a crucial role in shaping the characteristics of...

A polished plano-parallel plate that is contacted to an unpolished glass surface to permit see-through analysis of the material. The plate eliminates effects because of the surface quality of the...

A piece of glass, pyrex or quartz having one or both surfaces carefully ground and polished plano, generally flat to less than a tenth of a wavelength. Optical flats are used in surface testing to...

A telescopic eyepiece that produces a field of view between 40° and 50°. The eyepiece consists of a single element eyelens that is normally plano convex, and a cemented triplet that is...

An eyepiece consisting of two planoconvex lenses of the same focal length, with facing convex surfaces.