Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Essilor International (compagnie Generale D'optique)

Essilor International

Laurence Clerc

Umberto Rossini

Jean-Paul Cano

Jean-Michel Leger

Matthieu Le Prado

Anthony Saugey

Sophie Morales

William Fourcault

Jaroslaw Rutkowski

A magnetic resonance optical pumping isotropic magnetometer including a laser, a gas filled cell, a HF discharge circuit, RF magnetic field generating coils surrounding the cell, a first frequency regulating mechanism of an RF generator, a second polarization regulating mechanism of the laser beam, and a third regulating mechanism of the direction of the RF magnetic field. The direction of polarization of the laser beam at an inlet of the cell is orthogonally aligned with the magnetic field to be measured by virtue of a liquid crystal polarization rotator. The magnetometer is well-adapted to an integrated arrangement.

Isotropic and integrated optical pumping magnetometer

The invention relates to a method of producing a phase device operating at at least one wavelength (&#x3bb;) comprising a cell containing a liquid crystal possessing a helical structure, inserted between two alignment layers possessing rubbing axes and means for applying a voltage to said cell, said helical structure exhibits a number of helical turns k, said liquid crystal exhibiting a defined angle of twist &#x398; between the rubbing axes of the two alignment layers, characterized in that it comprises the following steps: &#x2014;the determination of a compensation angle &#x3b5; satisfying the following equation: (formula) with: N the integer closest to (formula) the angle of twist &#x398;=2K&#x3c0;&#x2212;&#x3b5;&#x394;n: the birefringence of the liquid crystal; d: the thickness of the liquid crystal cell; &#x3bb;: the wavelength of the light beam which passes through the liquid crystal cell; the rubbing of one of the faces in a direction of alignment of said liquid crystal molecules, defining the angle of twist: &#x3b8;=2K&#x3c0;&#x2212;&#x3b5;. 

Method of producing a phase device based on a twisted liquid crystal having optimized structure operating under unpolarized light

The present invention relates to a method for making a device provided with at least one closed enclosure filled with at least one liquid and closed with at least one flexible membrane based on an elastic material, comprising the steps of:

Method for making enclosures filled with liquid and closed by a membrane

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Brie et Angonnes, France

Laurence Clerc