Retarders, also known as Waveplates, are used to transmit light while modifying its polarization state without attenuating, deviating, or displacing the beam. Common Retarder applications include rotating linear polarization, or transforming linear polarization into circular polarization.
Fresnel Rhomb Retarders are available with design wavelengths of 532nm and 1064nm. By utilizing a specific angle, Fresnel rhomb retarders impart a retardance with each internal reflection of the light, totaling λ/4. Each design is paired with either VIS 0° or NIR II coatings to provide efficient transmission across a broad range of wavelengths.
Liquid Crystal Variable Retarders are constructed using precision polished, optically flat fused silica windows spaced a few microns apart. The cavity is filled with nematic liquid crystal material and sealed.
Polymer Retarder Film is an extremely durable, birefringent polymer sheet that has been designed to modify the polarization state of transmitted light. The highly transparent, achromatic λ/4 and λ/2 Polymer Retarder Films consist of a single layer, modified polycarbonate sheet that acts an achromatic retarder, and is optically and mechanically sound up to 90°C or 80°C respectively
Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) Redarders are designed for applications in the 3 – 9μm wavelength range. When compared to multiple order waveplates, zero order waveplates provide increased bandwidth and lower sensitivity to temperature change.
Quartz Retarders are ideal for a range of applications. Multiple order retarders are ideal for applications where the wavelength deviates less than ±1% from the design wavelength of the retarder.