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

25mm Dia. x -50mm FL, NIR II Coated, Double-Concave 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 #68-016 3-4 days
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Other Coating Options
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€45,00
Qty 1-9
€45,00
Qty 10+
€40,50
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Diameter (mm):
25.00 +0.0/-0.025
Effective Focal Length EFL (mm):
-50.00
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
N-BK7
f/#:
2.00
Numerical Aperture NA:
0.25
Coating:
NIR II (750-1550nm)
Type:
Double-Concave Lens
Wavelength Range (nm):
750 - 1550
Back Focal Length BFL (mm):
-50.82
Center Thickness CT (mm):
2.50
Center Thickness Tolerance (mm):
±0.10
Centering (arcmin):
<1
Clear Aperture CA (mm):
24.00
Coating Specification:
Rabs ≤1.5% @ 750 - 800nm
Rabs ≤1.0% @ 800 - 1550nm
Ravg ≤0.7% @ 750 - 1550nm
Edge Thickness ET (mm):
5.40
Focal Length Specification Wavelength (nm):
587.6
Focal Length Tolerance (%):
±1.00
Radius R1=-R2 (mm):
-52.10
Surface Quality:
40-20
Damage Threshold, Reference: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
8 J/cm2 @ 1064nm, 10ns
Power (P-V) @ 632.8nm:
1.5λ
Irregularity (P-V) @ 632.8nm:
λ/4

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 235:
Compliant
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Product Family Description

  • AR Coated to Provide <0.7% Reflectance per Surface for 750 - 1550nm
  • Double-Concave Lenses Have Two Inward Curved Surfaces and a Negative Focal Length
  • Used for Image Reduction and to Spread Light
  • Various Coating Options: Uncoated, VIS-EXT, MgF2, VIS 0°, VIS-NIR, and NIR I

TECHSPEC® NIR II Coated Double-Concave (DCV) Lenses are designed to have two inward curved surfaces and a negative focal length similar to Plano-Concave (PCV) lenses. These lenses can be used for balancing aberrations created by other lenses within a system due to their negative spherical aberration. Double-Concave (DCV) lenses are commonly used in a variety of applications including image reduction, beam expansion and telescopes. TECHSPEC® NIR II Coated Double-Concave (DCV) Lenses offer optimal performance in the 750nm to 1550nm range.  These lenses are also available in Uncoated, VIS-EXT, MgF2, VIS 0°, VIS-NIR, or with NIR I AR coating options.