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A kind of polyvinyl alcohol coating on the surface of fused silica, preparation method and application

A technology of polyvinyl alcohol and polyvinyl alcohol solution, which is applied in coatings, instruments, optics, etc., can solve the problems of reduced laser damage threshold of fused silica optical elements, easy damage to the back surface, and reduced laser energy, so as to improve the resistance Laser damage performance, improved laser damage resistance, and simple preparation process

Active Publication Date: 2020-02-07
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
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Problems solved by technology

Therefore, the front surface has a higher laser damage threshold due to the reduced laser energy due to phase shift and plasma shielding, while the rear surface has higher energy deposition and stronger shock waves due to the interference of incident and reflected light waves, become more susceptible to damage
[0007] In addition, there are defects such as cracks and scratches on the surface and subsurface of fused silica, which will cause strong modulation of the incident laser electromagnetic field, thereby causing local high-intensity electric fields and thermal effect deposition, and ultimately lead to the laser damage threshold of fused silica optical components. significantly reduce
Hua et al. used the finite element difference time domain (FDTD) method to simulate the influence of the modulation effect of the front and rear surface defects on the electric field strength, and found that no matter whether the defect appeared on the front surface or the back surface, the maximum electric field strength was always near the back surface, making the back surface Surfaces are more susceptible to damage

Method used

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  • A kind of polyvinyl alcohol coating on the surface of fused silica, preparation method and application
  • A kind of polyvinyl alcohol coating on the surface of fused silica, preparation method and application

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[0031] One aspect of the present invention provides a method for preparing a polyvinyl alcohol coating on the surface of fused silica, comprising: filtering the polyvinyl alcohol aqueous solution with a mass percentage of 0.5%-5% by using a PVDF filter head with a pore size of 0.15-0.30 μm , and finally cooled for later use;

[0032] The polyvinyl alcohol is plated on the rear surface of the fused silica substrate with a clean surface by spin coating or pull coating, and the polyvinyl alcohol coating is obtained after drying. For example, the mass percentage of the solute of the polyvinyl alcohol solution in the embodiment of the present invention can be set to 0.5%, 1.5%, 2.5%, 3.5%, 4.5%, 5.0%.

[0033] Preferably, the polyvinyl alcohol coating has a thickness ranging from 40-80 nm, 160-200 nm and 280-320 nm.

[0034] Preferably, the polyvinyl alcohol has a molecular weight of 80,000-150,000 and a degree of alcoholysis of 87-100%. For example, the molecular weight of polyv...

Embodiment 1

[0044] Add 0.4g of polyvinyl alcohol with a molecular weight of 80,000-90,000 and a degree of alcoholysis of 87-89% into a 100mL conical flask, then add 80mL of ultrapure water and a magnetic rotor, and stir at 200rpm in a water bath at 60°C for 4 hours. Until it is completely dissolved, the insoluble matter and impurity particles are filtered out with a PDVF filter head with a pore size of 0.15 μm, and finally a clear and transparent polyvinyl alcohol solution is obtained, which is cooled to room temperature for coating. Fix a 20mm x 20mm x 2mm clean fused silica substrate on the vacuum chuck of the spin coater, then add 0.1mL polyvinyl alcohol solution dropwise and spread evenly, then spin coat at 500rpm for 3 minutes, and then put it in 80 °C oven for 3.0 hours.

[0045] A polyvinyl alcohol coating with a thickness of about 300 nm was obtained. This polyvinyl alcohol coating can increase the laser damage threshold of fused silica at a laser wavelength of 355nm by about 15%...

Embodiment 2

[0047] Add 1.2g of polyvinyl alcohol with a molecular weight of 90,000-100,000 and a degree of alcoholysis of 89-91% into a 100mL conical flask, then add 80mL of ultrapure water and a magnetic rotor, and stir at 300rpm for 3 hours in a water bath at 65°C. Until it is completely dissolved, the insoluble matter and impurity particles are filtered out with a PDVF filter head with a pore size of 0.22 μm, and finally a clear and transparent polyvinyl alcohol solution is obtained, which is cooled to room temperature for coating. Fix a 20mm x 20mm x 2mm clean fused silica substrate on the vacuum chuck of the spin coater, then drop 0.40mL of polyvinyl alcohol solution and spread it evenly, then spin coat at 1000rpm for 2.5min, and then put it in an oven at 90°C Dry in medium for 2.5 hours.

[0048] A polyvinyl alcohol coating with a thickness of about 200 nm was obtained. This polyvinyl alcohol coating can increase the laser damage threshold of fused silica at a laser wavelength of 3...

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Abstract

The invention provides a quartz watch surface polyvinyl alcohol plated coating layer, a preparation method and application and belongs to the technical field of optical material preparation. The preparation method comprises steps of using a PVDF filtering head with the aperture 0.15-0.30 [mu]m to filter polyvinyl alcohol solution with the mass percent of 0.5%-5% and cooling the solution for standby application; by spinning or pulling-through coating film, plating the polyvinyl alcohol on the back surface of a quartz base sheet with tidy surface; and drying the back surface to obtain the polyvinyl alcohol coating layer. The polyvinyl alcohol coating layer is capable of transferring the distribution of highest electric field intensity from the back surface of the quartz to the coating layer,so the electric field intensity of the back surface of the quartz is reduced. The laser damaged threshold value at the ultraviolet waveband is improved by 10%-20%; and the method is simple in processes, gentle in conditions, easy to control, low in cost, and environmentally friendly and has good application prospects in the field of optical materials.

Description

technical field [0001] The invention belongs to the technical field of optical material preparation, and in particular relates to a polyvinyl alcohol coating on the surface of fused silica, a preparation method and an application. Background technique [0002] Fused silica optical components are widely used in large-scale high-energy laser devices, such as the Shenguang III device in China and the National Ignition Facility in the United States. The surface of fused silica optical components is extremely vulnerable to damage under ultraviolet high-flux laser irradiation, which severely limits the output capability of laser devices and the service life of optical components. Therefore, it is very important to improve the laser-induced damage threshold of fused silica in the ultraviolet band. Significance. [0003] When the laser pulse acts on the fused silica optical element, due to energy deposition and adsorption, the thermal effect is first generated, and then the plasma ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/10G02B1/14C09D129/04
CPCC09D129/04G02B1/10G02B1/14
Inventor 李昌朋张庆军钟铭龙邵婷李青芝石兆华陈姝帆吴卫东蒋晓东
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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