Patent ID: 8358901

Claim:
An optic comprising: a wedge-shaped light guide having opposing first and second faces and comprising a material having a first refractive index, the first face supporting a cladding layer having a second refractive index less than the first refractive index; and a turning film bonded to the cladding layer via an interface layer, the interface layer presenting a third refractive index extending from the cladding layer to the turning film, the third refractive index matched to the first refractive index, wherein the optic is configured to attenuate a reflection of light having a median wavelength λ and wherein the thickness d of the cladding layer is given by d ≈ M ⁢ ⁢ λ 2 ⁢ ⁢ n 2 ⁢ 1 - ( n 2 / n 1 ) 2 , where n 1 is the refractive index of the wedge-shaped light guide, n 2 is the refractive index of the cladding layer and M is an odd integer.