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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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(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.

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