Sick | Stegmann Gmbh

Université Jean-monnet

Nikolay Lyndin

Olivier Parriaux

Yves Jourlin

Jean-François Bisson

Alexandre Tishchenko

Disclosed is a Rotation sensor with a light source, a light detector, an internal part having a first lateral surface, which is globally cylindrical and convex, and an external part having a second lateral surface which is globally cylindrical and concave. The first and second lateral surfaces both have a same central axis defining a rotation axis for a relative rotation between the internal part and the external part the angle of which this rotation sensor can measure. A first grating is arranged at the first lateral surface with its grating lines parallel to the rotation axis, and a second grating is arranged at the second lateral surface with its grating lines parallel to said rotation axis.

Cylindrical grating rotation sensor

For increasing the power emitted by surface emitting lasers and for improving the spatial coherence of the laser beam, emitted in particular by disk lasers, microchip lasers and VCSELs having a relatively wide emitting area, the invention proposes to select a low order transverse cavity mode by means of a mirror structure () of high reflectivity, and of high angular selectivity. The mirror structure comprises a multilayer () receiving the optical beam () and a resonant grating mirror () following the multilayer and arranged for highly reflecting the optical beam in a narrow angular range at each side of a determined incidence angle.

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Moscow, Russia

Nikolay Lyndin