Method of measuring reflection off multilayer dielectric coating

摘要

A method of measuring the absorption of a lens covered with multilayers of dielectric materials comprises directing a beam of polarized light against the dielectric materials, polarizing the diffused beam of reflected light, and measuring the energy in the polarized diffused beam of reflected light, which is representative of the reflective and absorptive properties of the multilayers of the dielectric materials. The diffused beam is polarized at an angle that is complementary to the angle of the linearly polarized light that is directed against the dielectric materials. The complementary angle serves to null the diffused beam of reflected light. <IMAGE>