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All Products / Optics / Optical Lenses / Achromatic Lenses / Near-IR (NIR) Achromatic 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

12mm Dia. x 20mm FL, NIR II Coated, Achromatic Lens

Any of our lenses with a diameter of 5mm or greater can be specified with blackened edges. To specify the blackening, simply append a –INK to the BBAR coated stock number.
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Stock #45-792 In Stock
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C$90.72 C$151.20
Qty 1-5
C$90.72 C$151.20
Qty 6+
C$72.66 C$121.10
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Diameter (mm):
12.00 +0.0/-0.025
Effective Focal Length EFL (mm):
20.00
Focal Length Tolerance (%):
±1
Back Focal Length BFL (mm):
14.18
Focal Length Specification Wavelength (nm):
880.00
Clear Aperture CA (mm):
11.00
Centering (arcmin):
<1
Center Thickness CT (mm):
10.50 ±0.10
Center Thickness CT 1 (mm):
8.00 ±0.05
Center Thickness CT 2 (mm):
2.50 ±0.05
Radius R1 (mm):
13.13
Radius R2 (mm):
-9.59
Radius R3 (mm):
-45.11
Edge Thickness ET (mm):
8.65
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
N-LAK22 / N-SF6
Surface Quality:
40-20
f/#:
1.67
Numerical Aperture NA:
0.30
Coating:
NIR II (750-1550nm)
Coating Specification:
Rabs ≤1.5% @ 750 - 800nm
Rabs ≤1.0% @ 800 - 1550nm
Ravg ≤0.7% @ 750 - 1550nm
Power (P-V) @ 632.8nm:
1.5λ
Irregularity (P-V) @ 632.8nm:
λ/4
Bevel:
Protective bevel as needed
Type:
Achromatic Lens
Wavelength Range (nm):
750 - 1550

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

  • Designed to Give Increased Resolution and Smaller Spot Sizes for NIR Wavelengths (750-1100nm)
  • Decreased Spherical Aberration for Monochromatic Sources Out to 2μm
  • Broadband AR Coating has <1% Reflectivity Between 750–1550nm

TECHSPEC® Near-IR (NIR) Achromatic Lenses are designed to provide the smallest spot size possible for polychromatic light between 750 and 1100nm. By utilizing our NIR doublets instead of standard doublets designed for the visible, the RMS spot diameter can be reduced from 43μm to 22.5μm, for example, when using polychromatic light. Spot size will be smaller when focusing on monochromatic sources. TECHSPEC Near-IR (NIR) Achromatic Lenses also reduce spherical aberration and perform superior when used with a monochromatic source up to 2μm in wavelength. Typical applications for these doublets include imaging lenses for the near infrared, focusing and expanding of NIR lasers, and focusing/collimating lenses for fiber optics and NIR LEDs.