Photonics Dictionary: Z

The intensity regulation of a cathode-ray tube by alteration of the grid-cathode voltage.

The introduction of a filter into an imaging system to implement a phase contrast for an intensity mapping of a pure phase image.

A grating that specularly reflects the specified long radiation wavelengths and diffracts the shorter wavelengths off in known directions, eliminating the interference of randomly scattered radiation.

A polyethylene grating that transmits the long wavelengths and diffracts shorter wavelengths in controlled directions.

Zerodur is a type of glass ceramic material known for its exceptional thermal and mechanical properties, particularly its low coefficient of thermal expansion (CTE) close to zero. It was developed by...

A polycrystalline material that transmits in the infrared; it is used as a phosphor in x-ray and television screens.

A plate of glass, usually a photograph, on which there is a central spot surrounded by concentric annular zones, alternately opaque and transparent, the radii of the boundaries between the zones...

An optical system of variable focal length, the focal plane remaining in a fixed position. This result is achieved by moving some of the components of the system along the lens axis, other components...