Centre National De La Recherche Scientifique

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

Université De Lille

Université Des Sciences Et Technologies De Lille

Université Lille 1 - Sciences Et Technologies

Géraud Bouwmans

Laurent Bigot

Arnaud Mussot

Emmanuel Hugonnot

Yves Quiquempois

Constance Valentin

Laure Lago

Yves Quimquenpois

Mohamed Bouazaoui

Bruno Capoen

Hicham El-Hamzaoui

Jean-Baptiste Trinel

Guillaume Le Cocq

Hicham El Hamzaoui

According to one aspect, a few-mode amplifying fiber in a given spectral band of use is provided. The few-mode amplifying fiber comprises a cladding having a given refractive index (n) and at least one core of refractive index and of dimensions suited to the propagation of a finite number of spatial modes in the spectral band of use of the fiber, a spatial propagation mode corresponding to a channel for transporting information. The core comprises a first solid material having a given first refractive index (n) strictly greater than the refractive index of the cladding (n), and, within said first material, inclusions spatially separated from one another, formed by longitudinal bars comprising a second solid material having a second refractive index (n) strictly greater than the first refractive index (n), at least one of said inclusions being actively doped.

Moderately multimodal amplifying 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

The process for the synthesis of a silica monolith comprises the following steps:

High purity silica monoliths and process for the synthesis thereof

Growing community of inventors

Velleneuve d'Ascq, France

Géraud Bouwmans