A method of making third-generation image intensifiers using gallium arsenide wafers

Abstract

The invention discloses a method for manufacturing a third-generation image intensifier by using a gallium arsenide wafer. The method comprises the steps of performing ultrasonic wave cleaning on the gallium arsenide wafer firstly, and then plating a platinum conductive layer; performing ultrasonic wave cleaning on the platinum-plated gallium arsenide wafer again, and performing high-frequency sealing and packaging with a high-temperature oxidized pulse power supply to form a sealing part; next, performing laser welding on an optical fiber image inverter which is subjected to cleaning, fluorescent powder coating and high-temperature shaping in sequence, and the sealing part to further form a core assembly; and performing packaging on the core assembly and a shell to complete the manufacturing. The production link is subjected to process control, so that the method is applicable to batch production, high in production efficiency, low in side reaction, and high in percent of pass of products; the used device or equipment can be purchased from the market, so that the cost is low and market monopoly can be broken; and in addition, the third-generation image intensifier is relatively long in service life and the service life can be prolonged from 10,000 hours as a common image intensifier to 30,000 hours.

Description

technical field [0001] The invention relates to a manufacturing method, in particular to a method for manufacturing a third-generation image intensifier using a gallium arsenide wafer. Background technique [0002] The commonly used manufacturing method of the third-generation image intensifier is: regularly send the fluorescent screen assembly into the ultra-high vacuum chamber through the loading gate chamber, carry out airtight degassing and electron bombardment cleaning, and then send it into the assembly ultra-high vacuum chamber; The photocathode assembly is sent into the ultra-high vacuum chamber through the loading gate chamber for airtight pre-degassing; then the photocathode assembly is sent to the adjacent ultra-high vacuum chamber for batch final cleaning and sensitization treatment, and the photocathode is formed and sent to assembly Ultra-high vacuum chamber: In the assembly ultra-high vacuum chamber, the photocathode and fluorescent screen components are assem...

AI Technical Summary

Problems solved by technology

[0004] 1. This method has higher requirements on the atmospheric pressure in the ultra-high vacuum chamber, which needs to be lower than 10 -11 Pascal can work normally, therefore, the time required for the degassing process of the vacuum chamber is long, resulting in low product production efficiency;

[0005] 2. Using this method, the air in the vacuum chamber is not easy to be completely removed. When the indoor temperature is increased, the remaining oxygen molecules, oxygen-containing gas and water vapor will react chemically with the surface of the photocathode, and it is easy to produce unqualified products.

According to statistics, using this method, the product qualification rate is usually only 40%;

[0006] 3. With this method, the requirements for the production environment, production equipment, and technical personnel are very high. A production line needs to invest hundreds of millions of yuan, but the output is limited, and the investment and income are not proportional;

[0007] 4. The service life of the image intensifier produced by this method is only 10,000 hours (about three years)

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