1/2-wave retardation plate – 430 – 700 nm , didaFirst

Retardation plates have different propagation velocities of the light wave, depending on the positioning.
They are specially cut in ordedr to have the waves on the slow axis delayed, of either one half wavelength or one quarter wavelength.

430 – 700 nm plates, Ø 18 mm, are made of polymeric material, 85 % efficient.