High-sensitivity antimony alkali photocathode and photomultiplier

The technology of sensitivity antimony base and photomultiplier tube is applied in the field of photoelectric detection, which can solve the problems of low sensitivity and high loss rate of incident light, and achieve the effects of improving sensitivity, improving absorption rate and improving performance.

Inactive Publication Date: 2014-04-09
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0012] The invention provides a high-sensitivity antimony alkali photocathode and photomultiplier tube, which mainly solves the problems of high incident light loss rate and low sensitivity of existing mechanisms

Method used

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  • High-sensitivity antimony alkali photocathode and photomultiplier

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Embodiment Construction

[0037] The main bottleneck in improving the efficiency of the existing photocathode is that the incident light is partially emitted and partially transmitted on the surface of the cathode, resulting in signal loss, which prevents the cathode from fully absorbing the incident light and converting it into photoelectrons. The reflection loss is due to the mismatch of the refractive index between the cathode substrate and the cathode. In order to solve this problem, a thin film is added between the substrate and the cathode to match the refractive index of the film with the substrate and the cathode to achieve antireflection. Effect.

[0038] The above content is realized in the following way: the high-sensitivity antimony alkali photocathode works in the transmission mode by making an anti-reflection layer between the photocathode substrate and the photocathode emission layer. The anti-reflection layer can reduce the reflection loss of the incident light at the interface, so that...

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Abstract

Disclosed are a high-sensitivity antimony alkali photocathode and a photomultiplier. Compared with a traditional photocathode, the sensitivity of the photocathode is significantly improved. The high-sensitivity antimony alkali photocathode comprises a photocathode substrate, wherein a cathode anti-reflection layer is arranged on the photocathode substrate, and an antimony alkali photocathode emission layer is arranged on the cathode anti-reflection layer. The refractive index of the anti-reflection layer ranges from 2.3 to 2.6, and therefore loss of incident light can be greatly reduced; furthermore, electrons of which the advancing direction is opposite to the direction of the incident light can be reversed in a certain extent, and therefore the quantum efficiency of the photocathode can be improved.

Description

technical field [0001] The design of the invention belongs to the technical field of photoelectric detection, and specifically relates to an antimony alkali photocathode capable of absorbing incident light within a response spectrum range and emitting electrons, and a photomultiplier tube prepared by using the antimony alkali photocathode. Background technique [0002] The photomultiplier tube is an optoelectronic device used to detect low-light signals, and the photocathode is its photoelectric signal conversion part, which is attached to the inner surface of the photomultiplier tube glass bulb by vacuum evaporation and generates photoelectrons under illumination. Since GaAs photocathode is difficult to fabricate and cannot be fabricated on curved substrates, antimony alkali photocathodes are mostly used in photomultiplier tubes at present. According to the direction of incident light and outgoing electrons, photocathodes are divided into two categories: transmissive and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/34H01J40/06H01J9/12
Inventor 徐向晏安迎波孙巧霞刘虎林曹希斌卢裕田进寿董改云
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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