25.4mm Dia. x 25.4mm FL, Uncoated, ISP Optics Silicon (Si) Aspheric Lens | ASPH-SI-25-25

Product Details Transmission from 1.2 – 7μm Diffraction-Limited Performance Available Uncoated or HDAR Coated for 3 – 5μm ISP Optics Silicon (Si) Aspheric Lenses provide diffraction-limited performance for weight-sensitive, Mid-Wave Infrared (MWIR) applications. Available uncoated for applications in the 1.2 – 7μm range or with a high durability anti-reflection (HDAR) coating in the 3 – 5μm range, these lenses are ideal for harsh environment or black body radiation applications. Silicon features a Knoop Hardness of 1150 making it harder and less brittle than Germanium. ISP Optics Silicon (Si) Aspheric Lenses feature a low density of 2.329g/cm 3 , making them lightweight alternatives to Germanium and Zinc Selenide. Specifications General Model Number: ASPH-SI-25-25 Physical & Mechanical Properties Diameter (mm): 25.40 +0.00/-0.13 Center Thickness CT (mm): 3.00 ±0.20 Edge Thickness ET (mm): 1.73 Clear Aperture CA (mm): 22.86 Centering, ETD (μm): <20 Shape of Back Surface: Concave Bevel: Protective as needed Surface Roughness (Å): <100 Ra Optical Properties Effective Focal Length EFL (mm): 25.40 Back Focal Length BFL (mm): 23.15 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Silicon (Si) f/#: 1.00 Numerical Aperture NA: 0.50 Coating: Uncoated Wavelength Range (nm): 1200 - 7000 Surface Quality: 60-40 Irregularity (P-V) @ 632.8nm: λ/4 Conjugate Distance: Infinite Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 240: Compliant ×