An apparatus and a method for changing refractive index

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 25/62 (2006.01) C03B 37/10 (2006.01) G02B 6/124 (2006.01) G02B 6/13 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2363719

In an apparatus and a method for changing the refractive index of at least part of a sample the degree with which the photosensitivity of the sample is decreased during UV exposure, the temperature of the sample is controlled at least during part of the exposure process in order to keep the temperature of the sample within a predetermined range. Preferably the temperature is kept low by a cooling device keeping the temperature within the range of -100 - +10~C. The sample to be exposed comprises a glass material, which is first subjected in a so-called loading process to pressures above 1 bar by H2 or D2, or other materials that act to enhance the UV-sensitivity of the glass. In an embodiment of the invention the method and the apparatus further comprises control means for controlling the relative movement between mounting means for a glass sample and one or more optical light beams.

L'invention concerne un dispositif et un procédé de changement de l'indice de réfraction d'au moins une partie d'un échantillon dont le degré de photosensibilité est diminué lors de l'exposition aux U.V., la température de l'échantillon étant régulée pendant au moins une partie du processus d'exposition, de manière à être maintenue dans une plage déterminée. De préférence, on conserve une température basse au moyen d'un dispositif de refroidissement maintenant une température comprise entre -100 et +10 ·C. L'échantillon à exposer comprend un matériau de verre, d'abord soumis, dans un processus dit de charge, à des pressions supérieures à 1 bar, au moyen de H¿2? ou D¿2? ou d'autres matériaux servant à accroître la sensibilité aux U.V. du verre. Dans un mode de réalisation le procédé et le dispositif comprennent des moyens de commande d'un déplacement relatif entre des moyens de montage d'un échantillon de verre et un ou plusieurs faisceaux lumineux optiques.

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