9mm Dia. x -18mm FL, Uncoated, Double-Concave Lens

Product Details Wavelength Range of 350-2200nm Precision Diameter and Centration Tolerances Allow for Easy OEM Integration Wide Variety of Diameters and Focal Lengths Additional AR Coating Options Available: VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , NIR I , and NIR II TECHSPEC Uncoated 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 Uncoated Double-Concave (DCV) Lenses offer optimal performance in the 350nm to 2200nm range. These lenses are also available VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , NIR I , or with NIR II AR coating options. Specifications General Type: Double-Concave Lens Physical & Mechanical Properties Diameter (mm): 9.00 +0.0/-0.025 Center Thickness CT (mm): 1.50 ±0.05 Edge Thickness ET (mm): 2.45 Centering (arcmin): <1 Clear Aperture CA (mm): 8.1 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): -18.00 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): -18.49 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More N-BK7 f/#: 2.00 Coating: Uncoated Wavelength Range (nm): 350 - 2200 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): -18.86 Numerical Aperture NA: 0.25 Regulatory Compliance RoHS 2015: Compliant × Reach 219: Compliant × Certificate of Conformance: View ×