Optical properties of bialkali photocathodes
Abstract
The optical properties of the `bialkali' KCsSb and RbCsSb photomultiplier cathodes have been experimentally investigated in the visible range. The measurements carried out include the absolute reflectance at near-normal incidence, the polarization-dependent relative reflectance at various angles and the change in polarization upon reflection from the photocathode. These experimental inputs have been combined with a theoretical model to determine the complex refractive index of the photocathodes in the wavelength range 380 to 680 nm and their thickness. As a result of this work, we derive a model which predicts the fraction of light impinging on a photomultiplier tube that is reflected, absorbed or transmitted, as a function of wavelength and angle, and dependent on the medium to which the photomultiplier is coupled.
Cite
@article{arxiv.physics/0408075,
title = {Optical properties of bialkali photocathodes},
author = {Dario Motta and Stefan Schoenert},
journal= {arXiv preprint arXiv:physics/0408075},
year = {2008}
}
Comments
51 pages (double spacing), 16 figures, submitted for publication in NIM A