20.0mm Dia. x -40 FL, Uncoated, Plano-Concave Lens

Product Details Wavelength Range of 400-2200nm Precision Diameter and Centration Tolerances Allow for Easy OEM Integration Wide Variety of Diameters, Focal Lengths, and Coatings Anti-Reflection Coating Options: VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , YAG-BBAR , NIR I , and NIR II TECHSPEC Uncoated Plano-Concave (PCV) Lenses are designed to bend parallel input rays to diverge from one another on the output side of the lens causing this lens to have a negative focal length. These lenses can be used for balancing aberrations created by other lenses within a system due to their negative spherical aberration. Plano-Concave (PCV) lenses are commonly used in a variety of applications including image reduction, beam expansion and telescopes. TECHSPEC Uncoated Plano-Concave (PCV) Lenses offer optimal performance in the 350nm to 2200nm range. These lenses are also available VIS-EXT , MgF 2 , VIS 0° , VIS-NIR , YAG-BBAR , NIR I , or with NIR II AR coating options. Specifications General Type: Plano-Concave Lens Physical & Mechanical Properties Diameter (mm): 20.00 +0.0/-0.025 Center Thickness CT (mm): 3.50 ±0.10 Edge Thickness ET (mm): 5.92 Centering (arcmin): <1 Clear Aperture CA (mm): 19.00 Bevel: Protective as needed Optical Properties Effective Focal Length EFL (mm): -40.00 Focal Length Specification Wavelength (nm): 587.6 Back Focal Length BFL (mm): -42.31 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 (mm): -20.67 Numerical Aperture NA: 0.25 Regulatory Compliance RoHS 2015: Compliant × Reach 219: Compliant × Certificate of Conformance: View ×