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25mm Dia. x 25mm FL, Uncoated, Ge Plano-Convex Lens

Stock #69-637 In Stock
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Diameter (mm):
25.00 +0.0/-0.1
Effective Focal Length EFL (mm):
25.00 @ 10.6µm
Back Focal Length BFL (mm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Germanium (Ge)
Surface Quality:
Centering (arcmin):
Center Thickness CT (mm):
3.00 ±0.10
Edge Thickness ET (mm):
Radius R1 (mm):
Clear Aperture CA (mm):
Numerical Aperture NA:
Plano-Convex Lens
Protective bevel as needed
Wavelength Range (nm):
2000 - 14000

Regulatory Compliance

RoHS 2015:
Reach 224:
Certificate of Conformance:

Product Family Description

  • Available Uncoated or Coated for 3 - 5, 3 - 12, and 8 - 12µm
  • Minimal Chromatic Aberration Due to Low Dispersion
  • Ideal for Defense, Security, and Thermal Imaging Applications
  • Additional Infrared Lenses Available in Popular Substrates

TECHSPEC® Germanium (Ge) Plano-Convex (PCX) Lenses feature precision diamond turned substrates that are available uncoated or with a variety of broadband anti-reflection (AR) coatings from 3 – 12µm. Germanium is chemically inert and insoluble in water with a Knoop Hardness of 780, making it ideal for defense, security, and thermal imaging applications requiring rugged optics. However, germanium is subject to thermal runaway and should be used at temperatures below 100°C to ensure optimal transmission. TECHSPEC® Germanium (Ge) Plano-Convex (PCX) Lenses are available in 12.5, 25 and 50mm diameters. Germanium’s high index of refraction (4.003) yields significant Fresnel reflection loss without anti-reflection coatings. TECHSPEC® Germanium (Ge) Plano-Convex lenses are available uncoated or with multiple Broadband Anti-Reflection (BBAR) coatings for enhanced transmission in the Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR).

For more information on Germanium properties, please review our guide to selecting The Correct Material for Infrared (IR) Applications.