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All Products / Optics / Optical Lenses / Achromatic Lenses / Germanium Infrared (IR) Hybrid Aspheric Lenses
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

25mm Dia x 50mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

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Stock #68-265 Clearance 3-5 days
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A$1,550.40
Qty 1-5
A$1,550.40
Qty 6+
A$1,240.32
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Diameter (mm):
25.00 +0.0/-0.1
Effective Focal Length EFL (mm):
50.00 @ 4000nm
Numerical Aperture NA:
0.25
Back Focal Length BFL (mm):
47.91
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Germanium (Ge)
Aspheric Design Wavelength (nm):
4000
Asphere Figure Error, RMS @ 632.8nm:
λ/6
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):
2.01
Center Thickness CT (mm):
2.60 ±0.10
f/#:
2.00
Bevel:
Protective bevel as needed
Edges:
Diamond Turned
Radius R2 (mm):
64.8
Shape of Back Surface:
Concave
Type:
Aspheric Lens
Wavelength Range (nm):
3000 - 5000
Conjugate Distance:
Infinite

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
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Product Family Description

  • Color Corrected for 3 – 5μm
  • Near Diffraction Limited Focusing Performance
  • Full Prescription Data Available
  • Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.

Our TECHSPEC® Germanium Infrared (IR) Hybrid Aspheric Lenses provide diffraction limited focusing performance at any wavelength in the 3 – 5μm region, and near diffraction limited performance when used over the entire 3 -5μm spectral range. They are ideal for integration into imaging applications, FTIR spectrometers, or any Mid-Wave IR application utilizing a broad band light source.

Each hybrid aspheric lens is coated for >95% transmission for the most efficient use of costly infrared illumination. However, transmission is limited by the inherent diffraction efficiency of the aspheric surface, yielding lower overall transmission at the extremes of the design spectral band. For custom design or coating options, please contact our Sales Department.