PROCESS FOR REALISING A PHASE DEVICE BASED ON A TWISTED LIQUID CRYSTAL WITH AN OPTIMISED STRUCTURE FUNCTIONING WITH UNPOLARISED LIGHT

摘要

The invention relates to a method of producing a phase device operating at at least one wavelength (λ) comprising a cell containing a liquid crystal possessing a helical structure, inserted between two alignment layers possessing rubbing axes and means for applying a voltage to said cell, said helical structure exhibits a number of helical turns k, said liquid crystal exhibiting a defined angle of twist Θ between the rubbing axes of the two alignment layers, characterized in that it comprises the following steps: —the determination of a compensation angle ∈ satisfying the following equation: (formula) with: N the integer closest to (formula) the angle of twist Θ=2K&pgr;−∈&Dgr;n: the birefringence of the liquid crystal; d: the thickness of the liquid crystal cell; λ: the wavelength of the light beam which passes through the liquid crystal cell; the rubbing of one of the faces in a direction of alignment of said liquid crystal molecules, defining the angle of twist: &thetas;=2K&pgr;−∈. ɛ = 2  k   &pgr; - N   &pgr;  1 - d 2  &Dgr;   n 2 N 2  λ 2 ) 2  k  ( 1 + d 2  &Dgr;   n 2 4  k 2  λ 2 )