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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More
25mm Dia x 75mm FL 3-5μm Coated, Ge Aspheric Lens

Stock #68-250
Qty 1-5
Qty 6
Volume Pricing
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Diameter (mm):
25.00 +0.0/-0.1
Effective Focal Length EFL (mm):
Numerical Aperture NA:
Back Focal Length BFL (mm):
Focal Length Specification Wavelength (μm):
Center Thickness CT (mm):
Center Thickness Tolerance (mm):
BBAR (3000-5000nm)
Coating Specification:
Ravg <3.0% @ 3 - 5μm
Germanium (Ge)
Clear Aperture (%):
Asphere Figure Error (μm RMS):
Surface Quality:
Centering (arcmin):
Diamond Turned
Aspheric Lens
Wavelength Range (nm):
3000 - 5000
Type of Optics:
Meniscus Lens
Wavelength Range (μm):
3 - 5

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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