Please do not hesitate to contact us. We are ready to offer assistance and advice.+49 (0) 6131 - 580 89-0
By stretching a polymer film it becomes birefringent meaning that it has two different refractive indices. Those two orientations produce wave shifts commonly quarter wave, half wave or full wave. The resulting two axes are considered “fast” or “slow” because the fast axis has not been retarded like the slow one has by a portion of the wavelength.
By shifting the sheets ¼ lamba, circular polarized light can be created.
Using retarders in this way allows for any kind of polarization to be created with linear polarized light. The sheets do not have any useful effect on unpolarized light. While it is possible to produce almost any degree of retardation, only the three common wave values are of technical interest.