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E-68-261 25mm Dia x 20mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

Fosco Connect Part No.: E-68261

  • $ 1,235.00 or



E-68261 25mm Dia x 20mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

Product Coating Curve

Product Drawing

Diameter (mm): 25.00 +0.0/-0.1
Effective Focal Length EFL (mm): 20.00 @ 4000nm
Numerical Aperture NA: 0.63
Back Focal Length BFL (mm): 18.21
Substrate:  Germanium (Ge)
Aspheric Design Wavelength (nm): 4000
Coating: BBAR (3000-5000nm)
Coating Specification: Ravg <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): 1.36
Center Thickness CT (mm): 2.80 ±0.10
f/#: 0.79
Bevel: Protective bevel as needed
Edges: Diamond Turned
Radius R2 (mm): 35
Shape of Back Surface: Concave
Wavelength Range (nm): 3000 - 5000
Conjugate Distance: Infinite
Asphere Figure Error, RMS @ 632.8nm: λ/6
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