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All Products / Optics / Optical Lenses / Aspheric Lenses / Infrared / ISP Optics Silicon (Si) Aspheric Lenses
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25.4mm Dia. x 25.4mm FL, 3 - 5µm BBAR Coated, ISP Optics Silicon (Si) Aspheric Lens | HDAR35-ASPH-SI-25-25

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Diameter (mm):
25.40 +0.00/-0.13
Effective Focal Length EFL (mm):
25.40
Numerical Aperture NA:
0.50
Back Focal Length BFL (mm):
23.15
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Silicon (Si)
Coating:
BBAR (3000-5000nm)
Coating Specification:
Ravg <0.5% @ 3 - 5μm
Rabs <1.5% @ 3 - 5μm
Centering, ETD (μm):
<20
Surface Quality:
60-40
Clear Aperture CA (mm):
22.86
Edge Thickness ET (mm):
1.73
Center Thickness CT (mm):
3.00 ±0.20
f/#:
1.00
Bevel:
Protective bevel as needed
Shape of Back Surface:
Concave
Wavelength Range (nm):
3000 - 5000
Conjugate Distance:
Infinite
Surface Roughness (Å):
<100 Ra
Irregularity (P-V) @ 632.8nm:
λ/4
Model Number:
HDAR35-ASPH-SI-25-25

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 240:
Compliant
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Product Family Description

  • Transmission from 1.2 - 7μm
  • Diffraction-Limited Performance
  • Available Uncoated or HDAR Coated for 3 - 5μm

ISP Optics Silicon (Si) Aspheric Lenses provide diffraction-limited performance for weight-sensitive, Mid-Wave Infrared (MWIR) applications. Available uncoated for applications in the 1.2 - 7μm range or with a high durability anti-reflection (HDAR) coating in the 3 - 5μm range, these lenses are ideal for harsh environment or black body radiation applications. Silicon features a Knoop Hardness of 1150 making it harder and less brittle than Germanium. ISP Optics Silicon (Si) Aspheric Lenses feature a low density of 2.329g/cm3, making them lightweight alternatives to Germanium and Zinc Selenide.