Centre National De La Recherche Scientifique

Université´ D'aix-marseille

Université De Lille

Ecole Centrale De Marseille

Université D'aix-marseille (amu)

Universite Aix-marseille

Ecole Centrale De Marseille (ecm)

Centre National De La Recherche Scientifique-cnrs

Esben Ravn Andresen

Hervé Rigneault

Siddarth Sivankutty

Pascal Berto

Géraud Bouwmans

Olivier Vanvincq

Viktor Tsvirkun

According to one aspect, the invention relates to a device () for transporting and controlling light beams comprising a light guide () comprising a bundle () of uncoupled single-mode optical fibers (F), each single-mode optical fiber (F) being intended to receive an elementary light beam (B) at a proximal end and to emit a light beam (B) at a distal end, said bundle of single-mode optical fibers comprising, in operation, a minimum radius of curvature corresponding to a maximum curvature of the bundle of fibers. The device () furthermore comprises an optical device for phase controlling, said device being arranged on the side of the proximal end of the light guide () and comprising at least a first spatial light modulator () suitable for applying a phase shift to each of the elementary beams (B), and a control unit () for controlling the first spatial light modulator, said unit being configured to apply a phase shift to each of the elementary beams (B) so as to form, at the distal end of the light guide, an illumination beam with a predefined phase function. According to the present description, said bundle () of single-mode optical fibers is twisted, and comprises a twist period (P) defined to preserve said phase function at the distal end of the light guide when the bundle of single-mode optical fibers is subjected to a curvature lower than said maximum curvature.

Devices and methods for transporting and controlling light beams

According to one aspect, the invention relates to a device for transporting and controlling light beams for endo-microscopic imaging without a lens on the distal side comprising a single-mode optical fibre bundle () on the distal side, wherein each single-mode optical fibre is intended to receive an elementary light source and to emit a light beam at a distal end; a single-mode optical fibre section () arranged at the distal end of the optical fibre bundle and intended to receive the light beams emitted by the single-mode optical fibres of the optical fibre bundle; an optical phase control device arranged on the side of the proximal end of the single-mode optical fibres. The optical phase control device comprises at least one spatial light modulator () adapted to apply a phase shift to each of the elementary beams and control means () for controlling the spatial light modulator allowing application of a phase shift to each of the elementary beams to form an illumination beam with a determined phase function at the distal end of the multimode optical fibre section ().

Devices and methods for conveying and controlling light beams for lensless endo-microscopic imagery

According to one aspect, the invention concerns a device for transporting and controlling light pulses for lensless endo-microscopic imaging and comprises:

Device and method for controlling group velocity delays of pulses propagating in monomode optical fibers of a fiber bundle

According to one aspect, the invention relates to a device for detecting a resonant non-linear optical signal of Stimulated Raman Scattering (SRS) type induced in a sample. The device comprises electro-optical means for making interact in the sample, at a first modulation frequency, trains of light pulses of angular frequencies &#x3c9;and &#x3c9;and, at a second modulation frequency, trains of light pulses of angular frequencies &#x3c9;and &#x3c9;, such that &#x3c9;&#x2212;&#x3c9;=&#x3c9;&#x2212;&#x3c9;=&#x3a9;where &#x3a9;is a molecular vibrational resonant angular frequency of the sample. Moreover, the device comprises means for synchronous detection at the first and second modulation frequencies of non-linear optical signals resulting from the interaction of the light pulses in the sample, and electronic processing means making it possible to obtain, from electronic signals resulting from the synchronous detection, a signal characterizing the molecular vibrational resonance of the sample.

Device and method for stimulated Raman detection

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Lille, France

Esben Ravn Andresen