Phase Retardation Reflectors

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Phase Retardation Reflectors
Posting date : Feb 11, 2014
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84-
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Phase Retardation Reflectors Series PRR: Silicon for CO2 Lasers and 10.6μm These mirrors create a 90° Phase Shift with the aid of specially constructed thin film coating x-layers applied to the surface, when hit with a linear polarized beam at 45° to the plane of incidence. Commonly called Phase Shifters, Polarizers, or Circular Polarizing Mirrors, they tranform the incoming beam into a circular polarized state. They typically are only used external to the laser cavity as a beam delivery mirror. These operate only with a true 10.6μm laser wavelength and will not work at other wavelengths such as 9.2 or 9.6μm without special modifications to the thin film coating design. We offer non-standard wavelength Phase Retardation Reflectors at these other wavelengths as custom parts. Diameter Thickness Part Number .750" 0.120" PRRS-0712-90 1.000" 0.120" PRRS-1012-90 1.100" 0.120" PRRS-1112-90 1.500" 0.160" PRRS-1516-90 1.75 0.160" PPRS-1816-90 2.000" 0.200" PRRS-2020-90 50 mm 10 mm PRRMS-5010-90 2.000" 0.375" PRRS-2038-90 2.500" 0.250" PRRS-2525-90 3.000" 0.250" PRRS-3025-90 3.000" 0.500" PRRS-3050-90 75 mm 15 mm PRRMS-7515-90 Specifications: Material: Silicon (Si) Single Crystal Diameter Tolerances: +.000" -.005" Thickness: ±.010" Flatness: 1/40 wavelength Parallelism: < 3 minutes of arc Surface Quality: < 40/20 scratch dig Laser Finish Spectral Performance: Phase Shift: 90° ± 3.0° between p and s polarization for 10.6μm operation only 45° Angle Of Incidence Reflectance: > 99.0% average 10.6μm Absorption: < .40% 10.6μm Coating optimized to create 90° phase shift from a linear polarized beam. Used in beam delivery systems where cutting circles in materials is required.

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