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Phase Retarder

90˚ phase retarders (90RSI/RCU) are used to convert linear polarization to circular polarization. Circular polarization means an equal amount of s-pol and p-pol for any beam orientation. With 90˚ phase retarders used in cutting, the material can be removed uniformly regardless of cutting directions. Reflective Phase Retarders are used as beam bending mirrors external to the laser cavity to establish and maintain circular polarization. This requirement is particularly vital for laser material processing applications where cut or scribed edge quality, and weld penetration, are critical to the consistency and precision of the final part. Zero degree phase retarders (0RSI/RCU) maintain control over the circularly polarized beam.

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