Linearly Polarized Light Transmission from a Pair of Cycloidal Diffractive Waveplates

Coupled cycloidal diffractive waveplates (CDWP) can be used for double diffraction or collinearly propagation of laser radiation of the corresponding wavelength. Adding a doubly refracting and dichroic film between them enables one to obtain the finite transmission even in the absence of double refraction. Both in the cases of two parallel and antiparallel vector gratings, we have an achromatic transmission in the case of strong absorption (as well as in the case of the absence of anisotropic refraction).