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Characterization of the Absorption Coefficient of Varied Doped GaAs Photocathodes
Pages: 592-595
Year: Issue:  7
Journal: Infrared Technology

Keyword:  varied dopedGaAs photocathodesphoton absorption coefficientquantum efficiency;
Abstract: To ascertain the photon absorption coefficient of cathode material is one important condition of the theoretical investigation on photoemission performance of varied doped GaAs photocathodes. In this paper, the structure feature of varied doped cathode was analyzed, a concept of equivalent photon absorption coefficient was presented and the calculation method of equivalent photon absorption coefficient was provided. One varied doped GaAs photocathode sample was designed and the Cs、O activation experiment was carried out. The cathode quantum efficiency after activation was fitted by theoretical formula with the calculated equivalent photon absorption coefficient of the sample material. The fitting curve is in accordance with the experimental curve, which certifies the availability of the calculation method.
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