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

25mm Dia x 20mm FL Uncoated, Ge Aspheric Lens

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Stock #68-237 Other Coating Options
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€635,00
Qty 1-5
€635,00
Qty 6+
€500,00
Volume Pricing
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Specifications

Diameter (mm):
25.00 +0.0/-0.1
Effective Focal Length EFL (mm):
20.00 @ 4000nm
Numerical Aperture NA:
0.63
Back Focal Length BFL (mm):
19.08
Center Thickness CT (mm):
3.70 ±0.10
Coating:
Uncoated
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Germanium (Ge)
Clear Aperture CA (mm):
22.5
Surface Quality:
60-40
Edge Thickness ET (mm):
2.5
Centering (arcmin):
≤5
Bevel:
Protective bevel as needed
f/#:
0.79
Edges:
Diamond Turned
Shape of Back Surface:
Plano
Wavelength Range (nm):
2000 - 14000
Conjugate Distance:
Infinite
Focal Length Specification Wavelength (nm):
4000
Asphere Figure Error, RMS @ 632.8nm:
λ/6

Regulatory Compliance

RoHS 2015:
Reach 219:

Learn More

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.

Technical Information

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