... produce a phase difference of λ / 4 (π / 2,90 °), or λ / 2 (π, 180 °) of the beam.Wave plate can be divided into a ... multi-polar plate, zero-wave plate and true zero-wave plate and so on, and true zero-zero-wave plate is divided into ... more information, please contact us .Features1.High Power Zero-Order2.Low Power Zero-Order3.High Power Multi-Order4.Low Power Multi-Order5 ...