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All Products / Optics / Optical Lenses / Aspheric Lenses / Infrared / Silicon Aspheric 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 50mm FL 3-5μm AR Coated, Si Aspheric Lens

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Stock #89-618 3-4 days
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£593.30
Qty 1-5
£593.30
Qty 6+
£474.64
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Diameter (mm):
25.00 +0.00/-0.10
Effective Focal Length EFL (mm):
50.00 @ 4000nm
Numerical Aperture NA:
0.25
Back Focal Length BFL (mm):
47.78
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Silicon (Si)
Aspheric Design Wavelength (nm):
4000
Asphere Figure Error, RMS @ 632.8nm:
λ/6
Coating:
BBAR (3000-5000nm)
Coating Specification:
Ravg <3% @ 3 - 5μm
Surface Accuracy, P-V (μm):
<0.3
Centering (arcmin):
≤10
Centering, ETD (μm):
<21.8
Surface Quality:
60-40
Clear Aperture CA (mm):
22.5
Edge Thickness ET (mm):
2.3
Center Thickness CT (mm):
3.00 ±0.10
f/#:
2.00
Bevel:
Protective bevel as needed
Edges:
Diamond Turned
Radius R2 (mm):
75.698
Shape of Back Surface:
Concave
Type:
Aspheric Lens
Wavelength Range (nm):
3000 - 5000
Conjugate Distance:
Infinite

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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REACH 241:
Compliant
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Product Family Description

  • Diffraction-Limited Performance
  • Low Density and Dispersion
  • Ideal for Weight Sensitive IR Applications
  • Available with BBAR (1650-3000nm) or Mid-Wave Infrared (3000-5000nm) AR Coatings

TECHSPEC® Silicon Aspheric Lenses are high performance, lightweight solutions for BBAR and Mid-Wave Infrared (MWIR) applications and are ideal alternatives for costly ZnSe lenses and brittle Germanium lenses. These lenses are available with efficient broadband AR coatings for the BBAR (1650-3000nm) or MWIR (3000-5000nm) spectral regions. TECHSPEC Silicon Aspheric Lenses feature the mechanical and thermal properties required to withstand many of the effects of harsh environments including fluctuations in temperature and pressure. Because silicon is a low density material, these lenses are also ideal for weight-sensitive systems, such as those found in many defense applications.