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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

25mm Dia. x 50mm FL, NIR I 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 #22-491 3-4 days
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Other Coating Options
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£111.35
Qty 1-5
£111.35
Qty 6+
£89.25
Volume Pricing
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Prices shown are exclusive of VAT/local taxes
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Specifications

General

Type:
Achromatic Lens

Physical & Mechanical Properties

Diameter (mm):
25.00 +0.0/-0.025
Clear Aperture CA (mm):
24.00
Centering (arcmin):
<1
Center Thickness CT (mm):
12.00 ±0.20
Center Thickness CT 1 (mm):
8.00 ±0.10
Center Thickness CT 2 (mm):
4.00 ±0.10
Edge Thickness ET (mm):
8.94
Bevel:
Protective bevel as needed

Optical Properties

Effective Focal Length EFL (mm):
50.00
Focal Length Tolerance (%):
±1
Back Focal Length BFL (mm):
43.29
Focal Length Specification Wavelength (nm):
880.00
Radius R1 (mm):
31.69
Radius R2 (mm):
-28.45
Radius R3 (mm):
-161.05
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
N-LAK22 / N-SF6
Surface Quality:
40-20
f/#:
2.00
Numerical Aperture NA:
0.25
Coating:
NIR I (600-1050nm)
Coating Specification:
Ravg ≤0.5% @ 600 - 1050nm
Power (P-V) @ 632.8nm:
1.5λ
Irregularity (P-V) @ 632.8nm:
λ/4
Wavelength Range (nm):
600 - 1050

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
View
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Reach 240:
Compliant
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Product Details

  • 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.

Technical Information

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.