Rare earth doped transparent halide split-phase glass host material

Abstract

The invention provides a rare earth doped transparent halide split-phase glass matrix material used for three-dimensional optical storage. The invention is characterized in that the glass comprises the following compositions based on mol percentage: 25 to 40 percent of AlF3, 5 to 65 percent of MgF2, 1 to 15 percent of MX2, 10 to 20 percent of YF3, and 0.1 to 1 percent of ReF3, wherein, M represents one or more of divalent alkaline earth ions of Mg<2+>, Ba<2+> and Sr<2+>; X is one or two of ions of Br<-> and Cl <->; and Re is one or more of trivalent rare earth ions of Sm<3+>, Tb<3+>, Eu<3+> and Ce<3+>. In the rare earth doped transparent halide split-phase glass, a rare-earth ion Re changes an energy threshold value of a valence below 10nJ through the action of femto-second laser, which is more beneficial for information writing of the femto-second laser. After the action of the femto-second laser, the rare earth ion in a halide split-phase has better illumination intensity because of the change of a ligand field.

Description

technical field [0001] The invention relates to the technical field of three-dimensional optical storage materials in information technology, in particular to a rare earth-doped transparent halide phase-separated glass matrix material for three-dimensional optical storage of femtosecond laser writing and reading in transparent media. Background technique [0002] Due to the narrow pulse width of the femtosecond laser, the energy can be injected into a highly spatially selective area of ​​the material within the characteristic time when the material absorbs the laser energy and finally transfers it to the crystal lattice in the form of heat energy, achieving little thermal influence. Ultrafine processing of materials that are difficult to achieve with nanosecond and picosecond lasers. At the same time, even if the material itself does not have intrinsic absorption at the laser wavelength, due to the ultra-high electric field strength near the focal point of the focused femtos...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantage of the relatively high energy threshold of the rare earth ion valence state transition in the glass system of the current three-dimensional optical storage material femtosecond laser that is not strongly reducible to rare earth ions, and to provide a kind of glass system with excellent stability and mechanical properties. Rare earth-doped transparent halide phase-separated glass matrix material that can easily change the valence state of rare earth ions

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