12mm Dia. x -24mm FL, NIR II Coated, Double-Concave Lens

Product Details AR Coated to Provide <0.7% Reflectance per Surface for 750 - 1550nm Double-Concave Lenses Have Two Inward Curved Surfaces and a Negative Focal Length Used for Image Reduction and to Spread Light Various Coating Options: Uncoated , VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , and NIR I TECHSPEC NIR II Coated Double-Concave (DCV) Lenses are designed to have two inward curved surfaces and a negative focal length similar to Plano-Concave (PCV) lenses. These lenses can be used for balancing aberrations created by other lenses within a system due to their negative spherical aberration. Double-Concave (DCV) lenses are commonly used in a variety of applications including image reduction, beam expansion and telescopes. TECHSPEC NIR II Coated Double-Concave (DCV) Lenses offer optimal performance in the 750nm to 1550nm range. These lenses are also available in Uncoated , VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , or with NIR I AR coating options. Specifications General Type: Double-Concave Lens Physical & Mechanical Properties Diameter (mm): 12.00 +0.0/-0.025 Center Thickness CT (mm): 2.00 ±0.05 Edge Thickness ET (mm): 3.31 Centering (arcmin): <1 Clear Aperture CA (mm): 11.00 Optical Properties Effective Focal Length EFL (mm): -24.00 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): -24.65 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 f/#: 2.00 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): -25.14 Numerical Aperture NA: 0.25 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 ×