Patent ID: 6212014
Filing Date: 2001-04-03
Classification: G02B

Abstract:
A method of fabricating an infrared beamsplitter from first and second prismatic elements, comprising the steps of:applying a polarization coating to the first prismatic element;placing a refractive index liquid layer on one of said polarization coating and said second prismatic element, said refractive index liquid layer having a refractive index range between 1.705 to 1.800 and a thickness in combination with the flatness of said polarization coating and the viscosity of said refractive index liquid layer so as to beamsplit infrared, said thickness being less than 600 nm;placing said second prismatic element over said first prismatic element so that said liquid coating is contained between said polarization coating and said second prismatic element, wherein said first and second prismatic elements have matching refractive indexes so as to beamsplit infrared; andsealing the edges of said assembly to maintain said refractive index liquid layer between said first prismatic element and said second prismatic element.