title: High-accuracy translation-rotation encoder with two gratings in a Littrow mount.
abstract: A new type of translation-rotation encoder that makes use of two identical transparent dielectric gratings lighted in a -1-order Littrow mount is proposed. The correct choice of the wavelength-to-groove-spacing ratio produces only two transmitted beams, which interfere with the highest possible visibility in a large range of experimental conditions. Thus this mounting permits high-accuracy encoders to be produced by the use of cheap photoresist or plastic gratings and opens the way to industrial applications in high-precision mechanics, information processing, etc.
authors.affiliation: Laboratoire d'Optique Electromagnétique, Unité Propre de Recherche de l'Enseignement SupérieurAssociée, Faculté des Sciences de St-Jérôme, Case 262, Centre National de la Recherche Scientifique 6079, 13397 Marseille Cedex20, France.
authors.forename: M
authors.initials: M
authors.lastname: Nevièvre
authors.forename: E
authors.initials: E
authors.lastname: Popov
authors.forename: B
authors.initials: B
authors.lastname: Bojhkov
authors.forename: L
authors.initials: L
authors.lastname: Tsonev
authors.forename: S
authors.initials: S
authors.lastname: Tonchev