Abstract

The modulation transfer function (MTF) of transmission-mode exponential-doping photocathodes has been solved from the 2-dimensional continuity equations. According to the MTF equation,we calculated and analyzed the theoretical resolution characteristic of the exponential-doping photocathodes. The calculated results show that,compared with the uniform-doping photocathodes,the exponential-doping structure can increase the resolution of photocathodes evidently. For the spatial frequency franges between 100 and 400 lp/mm,the increase of resolution is more pronounced. Let f=200 lp/mm,the resolution of exponential-doping photocathodes generally increases by 20%—50%. The resolution improvement of exponential-doping photocathodes,as well as the quantum efficiency improvement,is also attributed to the built-in electric field.

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