Phase Retarding Mirrors

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Monday, 06 February 2012

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:	10.6 µm
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

Applicable Coatings Quick Links
Infrared Coatings:	Phase Retarding Mirror (PRM)

Call 303-664-5000 to discuss your optical requirements
Toll Free: 1-866-678-4270 Fax: 303-664-5001 Email: Sales@RMIco.com
Rocky Mountain Instrument Co. • 106 Laser Dr., Lafayette, CO • 80026 • USA

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