Abstract
We have measured the reflection coefficient, that is the loss of light, at the boundary between the cladding and the core of a plastic scintillating fiber. The coefficient was measured as a function of the wavelength of light, produced by a krypton laser, between 400 and 620 nm, and as a function of the angle of incidence of the light. The optical scintillating fibers, with a polystyrene core and a PMMA cladding, are those widely used for the detection of high-energy particles. We observed losses of the order of 10 −4 per reflection, which increase when going to shorter wavelengths and which have roughly a linear dependence on the angle of incidence.
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