20mm Dia. x 50mm FL, NIR II Coated, Double-Convex Lens

Product Details AR Coated to Provide <0.7% Reflectance per Surface for 750 - 1550nm Minimize Aberrations Including Spherical and Coma UV Fused Silica DCX Lenses Available Other Coating Options Available: Uncoated , MgF 2 , VIS 0° , NIR I , VIS-EXT , VIS-NIR , and YAG-BBAR TECHSPEC NIR II Coated 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 cancelled due to the symmetric lens design. TECHSPEC NIR II Coated Double-Convex Lenses are available in a variety of substrates and coating options for the visible and NIR spectra. Specifications General Type: Double-Convex Lens Physical & Mechanical Properties Diameter (mm): 20.00 +0.0/-0.025 Center Thickness CT (mm): 3.50 ±0.10 Edge Thickness ET (mm): 1.52 Centering (arcmin): <1 Clear Aperture CA (mm): 19.00 Optical Properties Effective Focal Length EFL (mm): 50.00 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): 48.84 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 f/#: 2.5 Coating: NIR II (750-1550nm) Coating Specification: R abs ≤1.5% @ 750 - 800nm R abs ≤1.0% @ 800 - 1550nm R avg ≤0.7% @ 750 - 1550nm Wavelength Range (nm): 750 - 1550 Surface Quality: 40-20 Power (P-V) @ 632.8nm: 1.5λ Irregularity (P-V) @ 632.8nm: λ/4 Focal Length Tolerance (%): ±1.00 Radius R 1 =-R 2 (mm): 51.08 Numerical Aperture NA: 0.20 Damage Threshold, Reference: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification. 8 J/cm 2 @ 1064nm, 10ns Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 235: Compliant ×