PRISM, PRISM PAIR, AND WAVELENGTH SELECTION DEVICE WITH THE PRISM PAIR

摘要

PROBLEM TO BE SOLVED: To provide a prism and a prism pair which are capable of increasing the magnification of a luminous flux while reducing polarization-dependent loss.;SOLUTION: By using an incidence angle θ_i1 of incident light on a first prism 31, an apex angle α of the first prism 31 and a refractive index n of the first prism 31, a magnification m of incident light is expressed by m=[cos(sin^-1(sinθ_i1/n))/cosθ_i1]×[cos(α+δ-θ_i1)/cos(α-sin^-1(sinθ_i1/n))]1 wherein δ:θ_i1+sin^-1[(sinα)(n²-sin²α)^1/2-sinθ_i1cosα]-α. When the refractive index is 1.4, the incidence angle θ_i1 is ≤27° and the apex angle α of the first prism 31 is 30 to 50°.;COPYRIGHT: (C)2011,JPO&INPIT