Results for three λ/4 phase retarders are reported. One of them is achromatic to within ± 0.06° of 90° in the visible region. It is shown that, under certain conditions, oblique incidence on the entrance face of total internal reflection phase retarders can greatly improve the achromaticity.
© 1994 Optical Society of America
N. N. Nagib and M. S. E-Bahrawy, "Phase retarders with variable angles of total internal reflection," Appl. Opt. 33, 1218-1222 (1994)