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Mixed acid and method for treating surface of optical fiber preform

An optical fiber preform and surface treatment technology, applied in the field of optical fiber preform, can solve the problems of ineffective corrosion, preform corrosion, affecting acid etching effect, etc., achieve uniform and stable acid etching reaction, reduce loss, and improve strength Effect

Active Publication Date: 2014-03-26
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that acid etching is effective at home and abroad. The general treatment method is to acid-etch the optical fiber preform with hydrofluoric acid or hydrofluoric acid combined with hydrochloric acid. However, there are a series of problems in this method: if the acid concentration is too high, the The preform corrosion is serious, but the effect is not good. If the acid concentration is too low, the corrosion effect will not be achieved. At the same time, the acid concentration will gradually decrease during the reaction process, and the products during the acid etching process will cover the surface of the preform, etc. will affect the acid etching effect

Method used

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  • Mixed acid and method for treating surface of optical fiber preform
  • Mixed acid and method for treating surface of optical fiber preform
  • Mixed acid and method for treating surface of optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0030] strong acid:

[0031]

[0032] Complexing agent:

[0033]

[0034] The mixed acid is composed of the strong acid, complexing agent and pure water in a molar ratio of 5:1:5; the diluted mixed acid is composed of an acid body, a complexing agent and pure water in a molar ratio of 5:1:40 constitute. The processed preform material is quartz glass, and the processing method has the following steps:

[0035] Step 1: Put the finely ground preform into a polytetrafluoroethylene box, add deionized water, and then put it into an ultrasonic cleaner for ultrasonic cleaning at 25°C.

[0036] Step 2: Pour out the deionized water in the box, add mixed acid and sonicate at 25°C for 180 minutes.

[0037] Step 3: Take out the preform, clean it with deionized water, and dry it.

[0038] Step 4: Polish the preform.

[0039] Step 5: Put the polished preform into the box, add diluted mixed acid, and ultrasonicate at 25°C for 20 minutes.

[0040] Step 6: Take out the preform, clea...

no. 2 example

[0043] strong acid:

[0044] Composition mol%

[0045] HNO 3 40

[0046] HF60

[0047] Complexing agent:

[0048] Composition mol%

[0049] h 2 C 2 o 4 50

[0050] NH 4 F 50

[0051] The mixed acid is composed of the strong acid, complexing agent and pure water in a molar ratio of 5:1:10; the diluted mixed acid is composed of the strong acid, complexing agent and pure water in a molar ratio of 5:1 :50 composition. The material of the processed preform is Yb-doped quartz glass, and the corresponding processing method has the following steps:

[0052] Step 1: Take the finely ground preform and put it into a polytetrafluoroethylene box, add deionized water, then put it into an ultrasonic cleaning machine and clean it ultrasonically at 25°C;

[0053] Step 2: Pour out the deionized water in the box, add mixed acid and ultrasonicate at 30°C for 150 minutes;

[0054] Step 3: Take out the preform, clean it with deionized water,...

no. 3 example

[0061] strong acid;:

[0062] Composition mol%

[0063] h 3 PO 4 30

[0064] HF 70

[0065] Complexing agent:

[0066] The mixed acid is composed of strong acid, complexing agent and pure water in a molar ratio of 5:1:15; the diluted mixed acid is composed of acid, complexing agent and pure water in a molar ratio of 5:1:60. The material of the processed preform is Yb-doped quartz glass, and the corresponding processing method has the following steps:

[0067] Step 1: Take the finely ground preform and put it into a polytetrafluoroethylene box, add deionized water, then put it into an ultrasonic cleaning machine and clean it ultrasonically at 25°C;

[0068] Step 2: Pour out the deionized water in the box, add mixed acid and sonicate at 40°C for 120 minutes;

[0069] Step 3: Take out the preform, clean it with deionized water, and dry it;

[0070] The fourth step: polishing the preform;

[0071] Step 5: Put the polished preform into the box, add d...

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Abstract

The invention provides a mixed acid and method for treating the surface of an optical fiber preform. The mixed acid comprises a strong acid, a complexing agent and pure water according to a certain ratio. The strong acid can effectively remove microcracks and foreign particles on the surface of the preform in a surface treatment process, and meanwhile, the surface is corroded evenly and stably in the presence of the complexing agent. The adopted surface treatment method comprises the steps of firstly removing a sunken layer and a microcrack layer on the surface of the finely ground preform in a certain temperature range with the mixed acid, then polishing the preform and finally treating the polished preform with the diluted mixed acid. By adopting the treatment method, the microcracks and foreign particles on the surface of the optical fiber preform can be furthest removed, so that the optical fiber preform can not fracture due to microcrack growth in an optical fiber drawing process, and the impurities on the surface can be effectively removed, thus achieving the aims of improving the strength of the optical fiber and reducing the loss of the optical fiber.

Description

technical field [0001] The invention relates to an optical fiber preform, in particular to a mixed acid and a treatment method for the surface treatment of an optical fiber preform. The strong acid in the mixed acid can effectively remove microcracks and impurity particles on the surface of the preform during the surface treatment process. The existence of the system makes the acid etching reaction on the surface uniform and stable. The surface treatment method adopted can remove microcracks and impurity particles on the surface of the optical fiber preform to the greatest extent, thereby greatly improving the strength of the optical fiber and reducing the loss of the optical fiber. Background technique [0002] Due to its strong anti-interference ability, low loss, and large information capacity, optical fiber has been widely valued and widely used in the fields of military and civilian communications and sensing. [0003] The strength and loss of the optical fiber are its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C15/00
Inventor 陈辉宇胡丽丽王孟于春雷王世凯王欣
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI