Method for optimizing photo cathode photo-response

Details Method for optimizing photo cathode photo-response Method for optimizing photo cathode photo-response

1991-02-11

1992-05-19

Rowan, Kurt

Electric lamp or space discharge component or device manufacturi

Process

With testing or adjusting

445 6, 445 13, 445 17, H01J 942, H01J 902

Patent

active

051143739

ABSTRACT:
A method for optimizing the photo-response of a photocathode having a gallium-arsenide layer and a cesium-oxide surface coating includes the steps of overcesiating the photocathode, sealing it in a vacuum tube and baking the assembly in an oven. The photo-response of the photocathode is measured while it is baked, such measurements comprising an input to a microprocessor which controls the baking process by varying the temperature and/or time of baking. The rate of increase of photo-response due to heating and optimizing the photo-response attributable to the cesium-oxide coating is determined by utilizing a formula which relates temperature and photo-response and permits room temperature photo-response to be projected from a measurement taken during the baking process. When the rate of increase shows a characteristic diminishing pattern, the photo-response has been maximized and the baking is terminated.

REFERENCES:
patent: 1860187 (1932-05-01), Koller
patent: 4708677 (1967-11-01), Blank et al.
patent: 4999211 (1991-03-01), Duggan

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