Centre National De La Recherche Scientifique

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

Université Lille 1 - Sciences Et Technologies

Constance Valentin

Arnaud Mussot

Laurent Bigot

Emmanuel Hugonnot

Géraud Bouwmans

Geraud Pierre Bouwmans

Yves Quiquempois

Laure Lago

Yves Quimquenpois

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

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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Croix, France

Constance Valentin