20mm Dia. x -20mm FL, NIR II, Inked, Double-Concave Lens

Diameter (mm):

20.00 ±0.025

Effective Focal Length EFL (mm):

-20.00

N-SF11

f/#:

1.00

Numerical Aperture NA:

0.50

Coating:

NIR II (750-1550nm)

Type:

Double-Concave Lens

Wavelength Range (nm):

750 - 1550

Back Focal Length BFL (mm):

-20.55

Center Thickness CT (mm):

2.00

Center Thickness Tolerance (mm):

±0.10

Centering (arcmin):

Clear Aperture CA (mm):

19.00

Coating Specification:

R_abs ≤1.5% @ 750 - 800nm
R_abs ≤1.0% @ 800 - 1550nm
R_avg ≤0.7% @ 750 - 1550nm

Edge Thickness ET (mm):

5.03

Focal Length Specification Wavelength (nm):

587.6

Focal Length Tolerance (%):

±1.00

Radius R₁=-R₂ (mm):

-31.82

Surface Quality:

40-20

Typical Energy Density Limit:

8 J/cm² @ 1064nm, 10ns

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Regulatory Compliance

RoHS:

Compliant

Certificate of Conformance:

View

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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