A preparation method of uniformly doped quartz glass rod
A quartz glass rod, uniform doping technology, applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of poor axial and radial uniformity, achieve uniform structure, reduce ion vaporization loss, and smooth absorption spectrum line shape clear effect
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Embodiment 1
[0029] Example 1, preparing an ytterbium-doped optical fiber preform.
[0030] First, the substrate tube is etched, and the substrate tube is heated with a mixture of chlorofluorocarbons and chlorine gas to etch the inner wall surface of the substrate tube; then several to hundreds of layers of quartz glass cladding are deposited, that is, in Deposition of pure SiO in a quartz glass substrate tube 2 or SiO doped with P / F 2 layer; then in the temperature range of 1200 to 1400 ℃, continue to deposit GeO containing 2 and / or P 2 o 5 Quartz glass powder, the particle size range of the powder is 10 to 200nm; GeO in the core 2 The concentration is 15 mol%.
[0031] The substrate tube containing the quartz glass powder is immersed in a chloride mixed aqueous solution containing Yb ions and Al ions, the concentration of Yb ions in the solution is 0.3mol / L, and the molar concentration ratio of Al ions and Yb ions in the solution is 30; Then place the substrate tube immersed in the...
Embodiment 2
[0044] The main parameters of Example 2 and Comparative Example 2 are listed in Table 1. The difference between the two is that Example 2 uses microwave drying when removing free water, while Comparative Example 2 turns off microwave drying. The results of the refractive index profiles of the solid rods made by the two are as follows: Figure 5 and Figure 6 shown. Under the premise that the other main steps are exactly the same, the microwave drying is turned off Figure 6 There is obviously a sag in the center of the refractive index profile of Comparative Example 2, while Figure 5 It is not obvious in Example 2, and those skilled in the art can easily understand that the central sag of the section reduces the performance of the optical fiber (poor beam quality, low damage threshold, etc.), which proves that microwave drying is beneficial to improve the radial doping uniformity of the solid rod section.
[0045] Table 1
[0046]
Embodiment 3
[0047] Example 3, preparing a platinum-doped optical fiber preform.
[0048] First, the substrate tube is etched, and then several to hundreds of layers of quartz glass cladding are deposited at 1295°C, followed by deposition of GeO in the tube at 1255°C 2 and P 2 o 5 Quartz glass powder, the particle size range of the powder is 10 to 40nm; GeO in the core 2 The concentration is 10 mol%. Immerse the substrate tube containing quartz glass powder in a mixed solution containing platinum nitrate and hydrochloric acid, the concentration of platinum nitrate in the solution is 0.05 to 0.5mol / L, and the concentration of hydrochloric acid is 0.1 to 1mol / L; The substrate tube of the solution was homogenized by ultrasonication for at least 30 min.
[0049] Take out the substrate tube adsorbed with the solution, microwave drying to remove free water; at 850°C, pass Cl into the tube 2 and O 2 The mixed gas removes the bound water and hydroxyl groups of the quartz glass powder, and th...
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