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Study on the effects of ion barrier film on photon reflectance of microchannel plate input surface

The presence of photon reflection in the input surface of the microchannel plate causes photon scattered noise, which reduces the signal-to-noise ratio of the micro-light image intensifier. The input surface of the microchannel plate was covered with ion barrier film, which had a great impact on the input surface photon reflection. In order to study the effects of ion barrier film Al2O3 on the photon reflection characteristics of microchannel plate input surface, this paper uses the spectrophotometer system to test the 4 groups filmed and un-filmed microchannel plate input surface reflectivity in the 200-800nm band range.The results show that the reflectivity of the microchannel plate with ion barrier film can be kept below 4% and about 2.0% lower than that of the un-filmed microchannel plate; and in the short wave interval, The amplitude of the reflectivity of the filmed and un-filmed microchannel plate is larger,the variation of the long wave interval is relatively gentle.That is valuable to reduce photon scattered noise of microchannel plate.