Substrate glass for optical communication, glass preform, optical element, and optical instrument

Abstract

The invention discloses substrate glass for optical communication, a glass preform, an optical element and an optical instrument. The substrate glass comprises the following components in percentage by weight: 30-50% of SiO2; 10 to 30 percent of TiO2; 15 to 30 percent of R2O; 0.5 to 10 percent of Al2O3; 0 to 10 percent of Y2O3; 0 to 10 percent of La2O3; 0-20% of MO; wherein R2O is at least one ofLi2O, Na2O and K2O; and M is at least one of Mg, Ca, Sr, Zn and Ba. According to the invention, the effects of SiO2, TiO2, R2O, Al2O3, MO, La2O3 and Y2O3 in the formula are comprehensively considered;all the components have a mutual synergistic effect; the dosage of each component is reasonably set; the cooperative mechanism is balanced, finally, the prepared substrate glass for optical communication has relatively high transmittance in a wave band of 960 to 1600nm; and the optical communication substrate prepared by the method does not change color under irradiation of space rays, has high elasticity modulus, has an expansion coefficient matched with that of a plated film, has better heat resistance compared with an optical communication substrate prepared from plastic, and has a lower cost compared with an optical communication substrate prepared from microcrystalline glass.

Description

Technical field [0001] The invention relates to the field of glass, in particular to substrate glass and glass preforms, optical elements and optical instruments for optical communication. Background technique [0002] In the optical communication network, the band center frequency of the band-pass filter will change with the change of temperature, so the temperature stability of the center wavelength of the band is raised. This requires that the substrate material used has a higher transmittance in the (960-1600nm) waveband, a high elastic modulus, and an expansion coefficient that matches the plating film. [0003] The substrate used in general optical filters is plastic. Due to the poor heat resistance of plastic, strong laser light is incident when the band pass filter is used, and the plastic is prone to deformation and deterioration. Glass-ceramic is an ideal substrate material. However, the melting process of glass-ceramics is difficult and the cost is high. Therefore, it i...

AI Technical Summary

Problems solved by technology

If the expansion coefficient of the glass does not match the inorganic film, it will cause the glass to burst when the film is coated

In addition, the long-term use of equipment in space and other ray environments will reduce the transmittance...

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