Method and device for producing optical material, and an...

C - Chemistry – Metallurgy – 03 – B

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C03B 37/014 (2006.01) C03C 13/04 (2006.01) F23D 11/00 (2006.01)

Patent

CA 2613576

The invention relates to the production of light-amplifying optical material. Liquid reactant (10) is atomized into droplets (15) using a high velocity gas (20) . The droplets (15) are subsequently introduced into a flame (100) . Reactants (10, 30) are oxidized in the flame (100) and condensed by forming small particles (50) . At least a fraction of said particles (50) is collected and fused to form optical waveguide material, which is subsequently drawn to form an optical waveguide (750) . According to the invention, the velocity of the atomizing gas (20) stream is in the range of 0.3 to 1.5 times the velocity of sound. The high velocity enhances atomization and increases reaction rates in the flame (100) . The residence times are reduced to such a degree that unwanted phase transformations in the produced particles (50) are substantially minimized. Consequently, very homogeneous material is produced. Especially, in the production of erbium-doped silica, low percentage of clustered erbium ions is achieved.

L'invention concerne la production d'un matériau optique d'amplification lumineuse. Selon l'invention, on atomise un réactif liquide (10) en gouttelettes (15) au moyen d'un gaz à haute vitesse (20). On introduit ensuite les gouttelettes (15) dans une flamme (100). Les réactifs (10, 30) s'oxydent dans la flamme (100) et se condensent en formant de petites particules (50). On recueille au moins une partie desdites particules (50) que l'on fond afin de former un matériau de guide d'ondes optiques que l'on étire ensuite afin de former un guide d'ondes optiques (750). Selon l'invention, la vitesse du flux de gaz d'atomisation (20) est comprise dans une plage de 0,3 à 1,5 fois la vitesse du son. La vitesse élevée favorise l'atomisation et augmente les vitesses de réaction dans la flamme (100). Les temps de séjour sont réduits dans une mesure telle que l'on minimise sensiblement les transformations de phase indésirables dans les particules produites (50). On obtient par conséquent un matériau très homogène. En particulier, dans la production de silicium dopé à l'erbium, on parvient à un très faible pourcentage d'ions erbium en grappes.

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