2.3″ x 2.3″, FL 1.2″, IR Fresnel Lens

Product Details Excellent Collecting Optics for Infrared Detectors Minimal Absorption Loss in the 8-14μm Region IR Fresnel lenses are molded in a flexible, 0.015″ (0.457mm) thick, milky white plastic. Advantages of this product are: least absorption loss in the 8-14μm region, extremely thin with consistent thickness across the lens, large apertures and minimal thermal expansion. The design of an infrared-transmitting Fresnel lens involves many complex considerations. The grooved side of a Fresnel lens should face the longer conjugate (away from the detector when used to collect radiation). If the smooth side needs to face the longer conjugate for some nonoptical reason, the maximum aperture of the lens should be f/1.0. In this case, total internal reflection keeps all radiation from the area of the lens past f/1.0 from reaching the image. Even when the grooves face the longer conjugate, the portion of the lens past f/1.0 contributes a diminished amount and there is no significant contribution past f/0.5. Specifications General Type: Fresnel Lens Physical & Mechanical Properties Dimensions (mm): 58.42 x 58.42 Dimensions (inches): 2.3 x 2.3 Effective Diameter (inches): 2.0 Center Thickness CT (inches): 0.02 Optical Properties Effective Focal Length EFL (mm): 30.48 Effective Focal Length EFL (inches): 1.20 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Poly IR Coating: Uncoated Wavelength Range (nm): 8000 – 14000 Coefficient of Thermal Expansion CTE (10 -6 /°C): 11 – 13 Flexural Modulus (psi): (100-260) x 10 3 Groove Density (grooves/inch): 125.00 Index of Refraction (n d ): Visible (Sodium D Line): 1.52 8-14µm: 1.53 15µm+: 1.48 Shore Hardness: D60-70 Wavelength Range (μm): 8 – 14 Young’s Modulus (GPa): 0.40 – 1.24 Environmental & Durability Factors Operating Temperature (°C): 100.00 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 242: Compliant ×