Phase Retarding mirror coatings are designed to produce a specific phase shift between the S and P polarization components of an incident CO₂laser beam. Coatings designed for 0。phase shift maintain the incident polarization state in the reflected beam. Coatings designed for λ/4 (90。) phase shift convert a linearly polarized beam into a circularly polarized beam. 

Coatings designed for λ/8 (45。) phase shift convert a linearly polarized beam into an elliptically polarized beam.

These and other coatings are available from stock on a variety of substrates. Other wavelengths and angles of incidence can be provided upon request. Please contact us for assistance with fulfilling your requirements.