Large Aperture retarders are available in a variety of different sizes and shapes with custom retardances at specific wavelengths. Combinations of different materials allow custom achromatic, athermal, or wide angle designs. Please contact your Meadowlark Optics Sales Engineer for a custom quote.
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For many astronomical, aerospace, and defense projects, large aperture retarders are required. Meadowlark Optics has over thirty-five years of retarder manufacturing expertise and is able to manufacture from a wide variety of materials to facilitate high or low power applications.
Waveplates up to 150 mm diameter are available. Some materials allow retarders to be used over different wavelengths from the ultraviolet, through the visible and into the near infrared.
Meadowlark Optics uses proprietary methods to ensure the best spatial uniformity of its polymer and crystalline retarders. These retarders have a spatial uniformity of better than two percent across the clear aperture and with the correct substrates, can have a wavefront distortion that is on par with Meadowlark Optics’ Precision Retarders.
Meadowlark Optic’s liquid crystal variable retarders can also be built with large clear apertures. Please contact your Meadowlark Optics Sales Engineer for assistance and a custom quote.
SPECIFICATIONS | |
Retarder (Birefringent) Material Options | Polymer Crystalline Quartz Magnesium Fluoride Sapphire Liquid Crystal† |
Wavelength | 300-2500 nm (please specify) |
Retardances | 0 to 100s of λ |
Retardance Accuracy | |
Center Spatial Uniformity | ≤ λ/100 to ≤ λ/350 ≤ λ/10 to ≤ λ/100 |
Transmitted Wavefront Distortion | ≤ λ to ≤ λ/5 (P-V @ 633) λ/4 to λ/20 (RMS @ 633)] |
Surface Quality | 40 – 20 scratch-dig to 80 – 50 scratch-dig |
Outside Dimensions | Up to 150 mm |