TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

12mm Dia. x -18mm FL, VIS-NIR Coated, Double-Concave Lens

Stock #48-943 In Stock
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Diameter (mm):
12.00 +0.0/-0.025
Effective Focal Length EFL (mm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Numerical Aperture NA:
VIS-NIR (400-1000nm)
Double-Concave Lens
Wavelength Range (nm):
400 - 1000
Back Focal Length BFL (mm):
Protective bevel as needed
Center Thickness CT (mm):
Center Thickness Tolerance (mm):
Centering (arcmin):
Clear Aperture CA (mm):
Coating Specification:
Rabs ≤0.25% @ 880nm
Ravg ≤1.25% @ 400 - 870nm
Ravg ≤1.25% @ 890 - 1000nm
Edge Thickness ET (mm):
Focal Length Specification Wavelength (nm):
Focal Length Tolerance (%):
Radius R1=-R2 (mm):
Surface Quality:
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
5 J/cm2 @ 532nm, 10ns
Power (P-V) @ 632.8nm:
Irregularity (P-V) @ 632.8nm:

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

Product Family Description

  • AR Coated to Provide <1.25% Reflectance per Surface for 400 - 1000nm
  • <0.25% Reflectance @ 880nm
  • Designed for 0° Angle of Incidence
  • Various Coating Options: Uncoated, VIS-EXTMgF2, VIS 0°, NIR I, and NIR II

TECHSPEC® VIS-NIR 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® VIS-NIR Coated Double-Concave (DCV) Lenses are optimized for transmission (>99%) in the near-infrared. These lenses are also available Uncoated, VIS-EXTMgF2VIS 0°, NIR I, or with NIR II AR coating options.