Commissariat a L'energie Atomique Et Aux Energies Alternatives

Centre National De La Recherche Scientifique

Université Lille 1 - Sciences Et Technologies

Université Lille I Sciences Et Technologies

Emmanuel Hugonnot

Arnaud Mussot

Laurent Bigot

Alexandre Kudlinski

Constance Valentin

Geraud Pierre Bouwmans

Géraud Bouwmans

Yves Quiquempois

Damien Bigourd

Laure Lago

Yves Quimquenpois

Patrick Beaure D'Augeres

Etienne Poeydebat

An optical parametric amplification device, including: an emitter emitting non-monochromatic light pulses as a pump wave; a stretcher configured to receive as an input pump wave, and to output a stretched pump wave; and a waveguide configured to receive as an input the stretched pump wave and chirped pulses, and to provide a wave resulting from a four wave mixing.

Optical parametric ultrashort pulse amplifier

A device for converting transverse spatial profile of intensity of a light beam, using a microstructured optical fiber. Transverse dimensions of the fiber vary longitudinally and both its ends have opto-geometrical parameters such that at the wavelength of the beam the fiber has a fundamental mode having two different profile shapes at its two ends. Thus by introducing the beam with one of the profiles through one of the two ends, the beam emerges through the other end with the other profile, whose shape is different from that of the profile of the introduced beam.

Device for converting the transverse spatial profile of intensity of a light beam, preferably using a microstructured optical fibre

Method and device for the optical parametric chirped pulse amplification, using two pump signals and making it possible to extend the spectral gain band. According to the invention, which is particularly applicable to laser-matter interaction, a four-wave mixing effect is used, preferably in an optical fiber (F), between each pulse (S) and the two pump signals (P, P); and the half-sum (fM) of the respective optical frequencies (fP1, fP2) of these signals pertains to the pulse spectrum support.

Method and device for the optical parametric amplification of pulses with frequency drift

The fiber comprises a core () having an index N and diameter of 10 &#x3bc;m or more, surrounded by a ring () having an index N+&#x394;n and thickness &#x394;R, and cladding () surrounding the ring and comprising for example air gaps (). According to the invention: &#x394;n&#x2267;10and &#x394;R=&#x3b1;/(&#x394;n)[1] where: 5&#xd7;10&#x3bc;m&#x2266;&#x3b1;&#x2266;5&#xd7;10&#x3bc;m and 0.5&#x2266;&#x3b2;&#x2266;1.5. The numbers &#x3b1; and &#x3b2; are dependent on the wavelength &#x3bb; of the light guided by the fiber, the number of missing gaps therein, the diameterof the gaps, the spacing &#x39b; thereof and N. To design the fiber, &#x3bb;, the number of missing gaps, d/&#x39b;, the core doping content, &#x39b; and &#x394;n are chosen; and &#x394;R is determined using equation [1] so as to obtain a flattened fundamental mode.

Microstructured optical fibre having a large core and a flattened fundamental mode, production method thereof and use of same in laser microfabrication

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Talence, France

Emmanuel Hugonnot