Diameter (mm):

25.00 +0.0/-0.1

Effective Focal Length EFL (mm):

40.00 @ 4000nm

Numerical Aperture NA:

0.31

Back Focal Length BFL (mm):

38.32

Germanium (Ge)

Aspheric Design Wavelength (nm):

4000

Asphere Figure Error, RMS @ 632.8nm:

λ/6

Coating:

BBAR (3000-5000nm)

Coating Specification:

R_avg <3.0% @ 3 - 5μm

Surface Accuracy, P-V (μm):

0.3

Centering (arcmin):

≤5

Surface Quality:

60-40

Clear Aperture CA (mm):

24.0

Edge Thickness ET (mm):

1.35

Center Thickness CT (mm):

2.10 ±0.10

f/#:

1.61

Bevel:

Protective bevel as needed

Edges:

Diamond Turned

Radius R₂ (mm):

52

Shape of Back Surface:

Concave

Type:

Aspheric Lens

Wavelength Range (nm):

3000 - 5000

Conjugate Distance:

Infinite

25mm Dia x 40mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens