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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
20mm Dia. x -20mm FL, NIR II, Inked, Double-Concave Lens
Effective Focal Length EFL (mm):
Back Focal Length BFL (mm):
Center Thickness CT (mm):
Center Thickness Tolerance (mm):
Rabs ≤1.5% @ 750 - 800nm
Rabs ≤1.0% @ 800 - 1550nm
Ravg ≤0.7% @ 750 - 1550nm
Focal Length Specification Wavelength (nm):
Focal Length Tolerance (%):
Typical Energy Density Limit:
8 J/cm2 @ 1064nm, 10ns
Irregularity (P-V) @ 632.8nm:
Certificate of Conformance:
Product Family Description
- 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, MgF2, VIS 0°, VIS-NIR, and NIR I
Double-Concave (DCV) Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light.
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