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Optical properties of bialkali photocathodes

MPG-Autoren
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Motta,  Dario
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schönert,  Stefan
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Motta, D., & Schönert, S. (2005). Optical properties of bialkali photocathodes. Nuclear Instruments and Methods in Physics Research Section A, 539(1-2), 217-235. Retrieved from http://de.arxiv.org/abs/physics/0408075.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-89AB-5
Zusammenfassung
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.