Field-assisted multiple alkalis photo-cathode

Abstract

The invention discloses a field-assistant multi-alkali IR photocathode. A metal grid is arranged behind a multi-alkali photocathode by a predetermined distance, and a voltage is applied by an external circuit to form a uniform electric field at the emergent face of photoelectrons. The multi-alkali photocathode is subjected to IR extension treatment, and comprises Na2KSb 80-90 percent, and K2CsSb 10-20 percent. By forming a uniform externally-applied electric field within a certain distance from the emergent surface of the photocathode, the inventive device can make the multi-alkali photocathode produce photoelectric response to near infrared waveband having a wavelength of at least 1,064 nm, and the photocathode has higher stability and the noise background than Ag-O-Cs cathode and higher photoelectric sensitivity and time characteristics than combined photocathode and has affinity for negative ions of III-V group. The IR photocathode has simple process and device and easy implementation, and can be made to product and fill the blank of existing vacuum IR photocathode in our country.

Description

Technical field: [0001] The invention relates to an infrared photocathode, in particular to a field-assisted multi-alkali infrared photocathode. technical background: [0002] The infrared photocathode devices in the prior art have important application value in social life, especially military equipment, but at present, there is no infrared photocathode device that can be sold as a product in my country, because the infrared photocathode is difficult to manufacture and the cost is high. [0003] Infrared photocathode devices are the core components of infrared detectors, please refer to "Progress and Prospect of Light Night Vision Technology", Aikecong, "Applied Optics", Vol.27, No.4, 2006, pp. 304-308, And, "Progress of Infrared Detectors", Zhu Xichen, Cheng Jin, "Opto-Mechatronic Information", No.10, 2001, pp. 30-34. [0004] Solid-state infrared detectors, typically infrared CCD focal plane array detectors, have been widely used in military and civilian applications in ...

AI Technical Summary

Problems solved by technology

But so far, due to its low infrared up-conversion luminous efficiency and some uncertain factors such as limited spatial resolution, fluorescence background noise and time response, its application is mainly limited to some non-quantitative observations, and it still cannot be used in such as Practical applications in laser communication, research on ultrafast phenomena, and military equipment

[0010] In short, so far, my country does not have the production capacity of infrared photocathode

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