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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

25mm Dia x 40mm FL 8-12μm Coated, Ge Aspheric Lens

Stock #68-256
€615.00
Qty 1-5
€615.00
Qty 6
€492.00
Volume Pricing
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Diameter (mm):
25.00 +0.0/-0.1
Effective Focal Length EFL (mm):
40.00
Numerical Aperture NA:
0.31
Back Focal Length BFL (mm):
37.89
Focal Length Specification Wavelength (nm):
4000
Center Thickness CT (mm):
3.10 ±0.10
Coating:
BBAR (8000-12000nm)
Coating Specification:
Ravg <3.0% @ 8 - 12μm
Substrate:
Germanium (Ge)
Clear Aperture CA (mm):
22.5
Asphere Figure Error (μm RMS):
0.1
Surface Quality:
60-40
Edge Thickness ET (mm):
2.38
Centering (arcmin):
≤5
Bevel:
Protective bevel as needed
f/#:
1.61
Coefficient of Thermal Expansion CTE (10-6/°C):
6.1
Edges:
Diamond Turned
Index of Refraction nd:
4.002 @ 11µm
Radius R2 (mm):
65.6
Shape of Back Surface:
Concave
Type:
Aspheric Lens
Wavelength Range (nm):
8000 - 12000
Conjugate Distance:
Infinite

Regulatory Compliance

RoHS 2015:
Reach 197:

Product Family Description

  • Diffraction Limited Performance
  • Variety of Coating Options
  • Full Prescription Data Available

Our TECHSPEC® Germanium Infrared (IR) Aspheric Lenses provide diffraction limited focusing performance over a broad spectral range in the Mid- and Long Wave infrared regions. Ideal for monochromatic light sources, such as quantum cascade lasers, these lenses offer a high performance alternative to standard plano-convex lenses.

Each aspheric lens is available uncoated, or with BBAR coating options. Uncoated germanium has transmission of <50%, so custom anti-reflection (AR) coatings should be considered if specifying an uncoated lens. Each BBAR coated lens offers >95% transmission, making it ideal for integration into a variety of OEM applications. For custom design or coating options, please contact our Sales Department.

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