18mm Dia. x 20mm FL, NIR I Coated, UV Double-Convex Lens

Product Details Ideal for Imaging Applications Minimize Aberrations Including Spherical and Coma Precision Fused Silica Substrate TECHSPEC UV Fused Silica Double-Convex (DCX) Lenses, also referred to as bi-convex lenses, have two positive, symmetrical faces with equal radii on both sides. These lenses are generally recommended for finite imaging applications with a conjugate ratio (ratio between object distance and image distance) between 0.2 and 5. At a conjugate ratio of 1, aberrations such as spherical aberration, chromatic aberration, coma, and distortion are minimized or canceled due to the symmetric lens design. TECHSPEC UV Fused Silica Double-Convex (DCX) Lenses have a precision fused silica substrate. These lenses are available uncoated or with UV-AR, UV-VIS, VIS-EXT, VIS-NIR, VIS 0°, NIR I, or NIR II coatings. Specifications General Type: Double-Convex Lens Physical & Mechanical Properties Diameter (mm): 18.00 +0.0/-0.025 Center Thickness CT (mm): 7.64 ±0.10 Edge Thickness ET (mm): 2.50 Centering (arcmin): <1 Clear Aperture CA (mm): 17.00 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): 20.00 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): 17.18 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Fused Silica (Corning 7980) f/#: 1.11 Coating: NIR I (600-1050nm) Coating Specification: R avg ≤0.5% @ 600 - 1050nm Wavelength Range (nm): 600 - 1050 Surface Quality: 40-20 Power (P-V) @ 632.8nm: 1.5λ Irregularity (P-V) @ 632.8nm: λ/4 Focal Length Tolerance (%): ±1 Radius R 1 =-R 2 (mm): 17.05 Numerical Aperture NA: 0.45 Damage Threshold, Reference: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification. 7 J/cm 2 @ 1064nm, 10ns Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×