Mica Waveplate

These products utilize birefringence of mica and give phase difference of λ/4 (π/2, 90°) or λ/2 (π, 180°) to the input beams. λ/4 plates convert linearly polarization to circularly and circularly polarization to linearly. λ/2 plates convert the direction of polarization in 90 degrees.

Usually linearly polarized beams are input to the waveplates in a leaning of 45 degrees against its optical axis.