High-accuracy translation-rotation encoder with two gratings in a Littrow mount

A new type of translation-rotation encoder that makes use of two identical transparent dielectric gratings lighted in a -1-order Littrow mount is prop osed. The correct choice of the wavelength-to-groove-spacing ratio produces only two transmitted beams, which interfere with the highest possible visi bility in a large range of experimental conditions. Thus this mounting perm its high-accuracy encoders to be produced by the use of cheap photoresist o r plastic gratings and opens the way to industrial applications in high-pre cision mechanics, information processing, etc. (C) 1999 Optical Society of America.