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Bulk photochromism in a tungstate-phosphate glass: A new optical memory material?
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View: Figures


Image of FIG. 1.
FIG. 1.

Photochromic phenomenon in a tungstate fluorophosphate glass by laser illumination. In (a), it can be seen that different features like a Y or the Einstein face can be written in the glass. In (b), the side of the written sample is presented and show that the photochromic effect occurs in the entire volume of the glass.

Image of FIG. 2.
FIG. 2.

Schematic representation of the photochromic effect in function of the laser beam characteristics. Exposure to UV laser light results in the apparition of the effect at the surface of the glass sample whereas exposure to visible light allows to obtain the effect in the whole volume of the glass. Irradiation by a femtosecond infrared laser focused inside the glass volume results in the photochromic effect at the focusing point.

Image of FIG. 3.
FIG. 3.

Absorption spectra of the glass in function of the irradiation time. The intensity of the absorption band observed in the visible and near infrared by visible light exposure appears after only a few minutes of irradiation and increases with the irradiation time.


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Scitation: Bulk photochromism in a tungstate-phosphate glass: A new optical memory material?