Microchannel photomultiplier tube with position-sensitive thin-film gate for space optical communication

Abstract

A microchannel photomultiplier with a position-sensitive film grid and used for space optical communication belongs to the technical field of photoelectric vacuum devices. In the prior art, the acceleration electric fields are too large; the acceleration distances are too long; and position-sensitive anodes are susceptible to self-saturation. The microchannel photomultiplier of the invention comprises a window, a photoelectric cathode, microchannel plates and an anode. The microchannel plates have multiple stages. Voltages in the same direction are applied between the photoelectric cathode, the multiple stages of microchannel plates and the anode. A photocurrent is output from the anode, and an anode microchannel plate is located between the microchannel plate of the last stage and the anode. The microchannel photomultiplier is characterized in that the position-sensitive anode is arranged at the front surface of the anode microchannel plate; an insulating film is located between the position-sensitive anode and a front metal film of the anode microchannel plate; the position-sensitive anode and the insulating film are both reticular films; meshes are corresponding to microchannelsof the anode microchannel plate; a laser communication locating light photocurrent is output by the position-sensitive anode; and a laser communication light photocurrent is output by the anode.

Description

technical field [0001] The invention relates to a micro-channel photomultiplier tube with a position-sensitive film gate for space optical communication, belonging to the technical field of photoelectric vacuum devices. Background technique [0002] A Chinese invention patent application with application number 201510510586.0 discloses a technical solution titled "Microchannel Photomultiplier Tube with Composite Waveguide Anode for Space Optical Communication", such as figure 1 As shown, the components of the scheme include window 1, photocathode 2, microchannel plate 3, and anode. The voltage is output photocurrent by the anode; the anode is composed of a transmissive anode 4, an anode microchannel plate 5, and a position-sensitive anode 6, and the transmissive anode 4 and the position-sensitive anode 3 are respectively located at the front and back of the anode microchannel plate 5, The electron beam focusing electrode 7 is located between the microchannel plate 3 of the ...

AI Technical Summary

Problems solved by technology

Such a long acceleration distance also provides a large space for electron beam scattering, thereby reducing the optical transmission capability of the micro-channel photomultiplier tube. As a last resort, this solution uses the electron beam focusing electrode 7 to modulate the wavefront of the high-energy electron cloud to make it converge

Second, the high-energy electron beam after tunneling is multiplied twice by the anode microchannel plate 5. If the signal input from the window 1 is too strong, in view of the structural characteristics of the position-sensitive anode 6, self-saturation will occur, thereby increasing the incident communication light. Optical axis positioning error

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