Diameter (mm):

20.00 +0.0/-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):

<1

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

8 J/cm² @ 1064nm, 10ns

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

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

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