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 ε satisfying the following equation: (formula) with: N the integer closest to (formula) the angle of twist Θ=2Kπ−εΔn: 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: θ=2Kπ−ε. ɛ = 2 ⁢ k ⁢ ⁢ π - N ⁢ ⁢ π ⁢ 1 - d 2 ⁢ Δ ⁢ ⁢ n 2 N 2 ⁢ λ 2 ) 2 ⁢ k ⁢ ( 1 + d 2 ⁢ Δ ⁢ ⁢ n 2 4 ⁢ k 2 ⁢ λ 2 )