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All Products / Optics / Optical Lenses / Plano-Convex (PCX) Lenses / UV and IR Plano-Convex (PCX) Lenses / Germanium (Ge) Plano-Convex (PCX) 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 35mm FL, Uncoated, Ge Plano-Convex Lens

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Stock #69-639 3-5 days
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Specifications

General

Type:
Plano-Convex Lens

Physical & Mechanical Properties

Diameter (mm):
25.00 +0.0/-0.1
Centering (arcmin):
<3
Center Thickness CT (mm):
3.00 ±0.10
Edge Thickness ET (mm):
2.25
Clear Aperture CA (mm):
24
Bevel:
Protective bevel as needed

Optical Properties

Effective Focal Length EFL (mm):
35.00 @ 10.6µm
Back Focal Length BFL (mm):
34.25
Coating:
Uncoated
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Germanium (Ge)
Surface Quality:
60-40
Radius R1 (mm):
105.14
f/#:
1.4
Numerical Aperture NA:
0.36
Wavelength Range (nm):
2000 - 14000

Regulatory Compliance

RoHS:
Compliant
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Reach 224:
Compliant
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Certificate of Conformance:
View
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Product Details

  • 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
  • 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.
  • Edmund Optics has limited remaining inventory of this part number and no raw material available to supply more once this is depleted.  Please contact our Product Support Engineers to help with an alternate solution for your needs. Customer Service can provide you the latest price and availability.

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.

Technical Information

AR COATED GERMANIUM

Typical transmission of a 3mm thick Ge window with BBAR (3000-5000nm) coating at 0° AOI.

The blue shaded region indicates the coating design wavelengh range, with the following specification: 

Ravg <3% @ 3000 - 5000nm

Data outside this range is not guaranteed and is for reference only.

Click Here to Download Data

Typical transmission of a 3mm thick Ge window with BBAR (3000-12000nm) coating at 0° AOI.

The blue shaded region indicates the coating design wavelengh range, with the following specification: 

Ravg <5.0% @ 3 - 12μm

Data outside this range is not guaranteed and is for reference only.

Click Here to Download Data

Typical transmission of a 3mm thick Ge window with BBAR (8000-12000nm) coating at 0° AOI.

The blue shaded region indicates the coating design wavelengh range, with the following specification: 

Ravg <3.0% @ 8 - 12μm

Data outside this range is not guaranteed and is for reference only.

Click Here to Download Data

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

Compatible Mounts