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Phase Retarding Mirrors Print E-mail

Phase Retarding Mirrors


Phase Retarding Mirrors are designed to produce a specific phase shift between the S and P polarization components of an incident CO2 laser beam. Mirrors designed for zero phase shift maintain the incident polarization state in the reflected beam. Mirrors designed for λ/4 (90º) phase shift convert a linearly polarized beam into a circularly polarized beam. Mirrors designed for λ/8 (45º) phase shift convert a linearly polarized beam into an elliptically polarized beam.

 

RMI STANDARD SPECIFICATIONS
Design wavelength: 10.6µm
Angle incidence:
 45º
Materials: Si, Cu
Surface Figure:
 λ/40 [λ/20] at 10.6 µm, S1
Surface Quality:
 40-20, S1
Fine grind, S2
Diameter Tolerance: + 0.000", – 0.010"
Thickness Tolerance: ± 0.010"
Wedge: ≤ 3 arc minutes
Bevels: 0.010" – 0.030" at 45º
Clear Aperture: Central 85% of diameter
Reflectance: R ≥ 98.5%
Retardation: 0: 0º ± 6º
λ/8: 45º ± 3º
λ/4: 90º ± 6º
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Infrared Coatings
    Phase Retarding Mirror (PRM) 
Last Updated ( Wednesday, 02 May 2007 )
 
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