Centre National De La Recherche Scientifique

Universitéde Strasbourg

Institut National Des Scienes Appliquees

Research Investment Network, Inc.

Alstom Transport Technologies

Institut National Des Sciences Appliquees

Joël Fontaine

Patrice Twardowski

Jianming Yang

Patrick Meyrueis

Idriss El Hafidi

Romualda Grzymala

Denis Miglianico

Renaud Kiefer

Olivier Devillard

Dalibor Vukicevic

An optical guide for a near-eye display device includes a first guide element having a light input zone and a second guide element having an output zone. The first guide element is superimposed on the second guide element. The optical guide also includes an optical coupling system between the first guide element and the second guide element, and the first and second guide elements have, on the first part of their length, a mutual spacing so as to delimit a thin layer of air between said guide elements extending between a first longitudinal end of the guide elements and the optical coupling system. The optical coupling system, located at a second longitudinal end of the first and second guide elements, includes a single-piece portion of the guide elements, associated with an optical reflection member to propagate the beams of light from the input zone toward the output zone.

Optical guide and optical system

The present invention relates to an apparatus and method for reading information from and recording information to a diffractive optics memory using symmetrical angular encoding. A coherent light source is split to form an object beam and a corresponding reference beam. An optical axis is defined by the object beam being aligned perpendicular to a plane of the diffractive optics memory. A steering mirror is configured to direct the reference beam received from the coherent light source to the memory. A first plurality of mirrors arranged around one side of the optical axis receives the reference beam from the steering mirror and directs the reference beam at a first angle towards the memory. A second plurality of mirrors arranged around the symmetrical side of the optical axis receives the reference beam from the steering mirror and directs the reference beam at a second angle towards the memory. The first angle is identical to the second angle but formed on the symmetrical side of the optical axis.

Method and apparatus for recording to and reading from a diffractive optics memory using symmetrical angular encoding

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Strasbourg, France

Joël Fontaine