optical wedge

wedge, optical 

A filter in which the transmittance varies continuously along a path (straight or curved) on its surface. If the filter transmits all the wavelengths more or less equally, it is called a neutral wedge. See Bielschowsky's phenomenon.
Mentioned in ?
References in periodicals archive ?
(1) Safety: Unlike the uncoated optical wedge beam-splitter, the ROC has only one reflected beam and one transmitted beam; consequently, no extra, high-order beams need to be blocked.
Reflective optical chopper used in NIST high-power laser measurements

Medical browser ?
Full browser ?