The fused silica play a key role among the High laser power device as the laser-transmitter. Many factor induced the damaging, such as the surface topography, the defect (bubbles, particulates), the doped-elements which can absorbing the laser-energy. Among them, the absorption of the specific wavelength laser can lead to the heating up which provide the motive power for the Silica tetrahedron Lattice disintegration. We did research on the absorption of the specific wavelength laser to find the relationship among the manufacturing process, the structure of the fused silica and the Laser damage threshold. From the research, there is rarely any relationship between the extent of the absorption of the specific wavelength laser and the OH. While the purity is the key factor.Although the Impure substance will lead to weak absorption, the LIDT of the 1064nm is beyond 100J/cm2.
Silica glass has many excellent properties such as high spectral transmittance and radiation resistance, and is widely used in semiconductors, lasers, optical instruments and other fields. The high performance synthetic silica glass prepared by SiCl4 has the problem of pollution of tail gas and waste water in the process of production, while chlorine-free organic silicon used in the preparation of synthetic silica glass can effectively solve the problem of environmental pollution. In this review, combined with the recent studies on the synthesis of silica glass using octamethylcyclotetrasiloxane(OMCTS, D4) as raw materials, this review mainly review the purification of octamethylcyclotetrasiloxane and the preparation technology of synthetic silica glass, as well as the characteristics of the internal reaction mechanism, and the related technologies, the prospect of synthetic silica glass technology is forecasted.
In this paper, synthetic silica glass was prepared by chemical vapor deposition using hydrogen and oxygen as carrier gases, respectively. Influences of different carrier gases on the distribution of hydroxyl and chlorine content and optical homogeneity in synthetic silica glass were investigated by ultraviolet-visible-near infrared spectrophotometer, X-ray fluorescence spectrometer and laser interferometer. The experimental results indicated that the hydroxyl content of silica glass prepared with hydrogen carrier gas is like a parabolic distribution, and the hydroxyl content decreases from 1270 ppm to 1020 ppm along the center to the edge of the silica glass in the direction of the transparent surface. The chlorine content distribution is the highest in the middle part of the glass, reaching about 60 ppm, while the other parts are basically the same and about 40 ppm. The change of refractive index caused by the distribution of hydroxyl and chlorine content is contrary and counteracts each other, which promotes the optical homogeneity of silica glass to be better. The hydroxyl content of silica glass prepared with oxygen carrier gas presents an inverse parabolic distribution, and the hydroxyl content increases from 880 ppm to 1010 ppm along the center to the edge of the silica glass in the direction of the transparent surface. The chlorine content increases from 60 ppm to 150 ppm and then decreases to about 40 ppm along the center to the edge of the silica glass. Because the distribution of hydroxyl content and chlorine content is extremely uneven, the change of refractive index caused by the distribution of hydroxyl and chlorine content can't offset each other, which leads to the optical homogeneity of silica glass to be poor. Therefore, synthetic silica glass with high optical homogeneity can be prepared by using hydrogen as the carrier gas.
The Oxygen-deficiency and the content and structure of OH had been proved to lead to various laser-irradiated damage threshold. In order to get the principle, we detected the changing tendency of the the Oxygen-deficiency and OH content after the irradiation without damaging. The results showed that the increasing of the Oxygen-deficiency and decreasing of the OH .Which is the result of the structure-collapsing and the effect to delaying the collapsing by Oxygen-deficiency and OH.
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