Unmounted N-BK7 Symmetric-Concave Lenses

Unmounted N-BK7 Symmetric-Concave Lenses, ARB2-NIR

Excelitas offers a wide selection of LINOS® symmetric-concave lenses made of N-BK7 glass available in various focal lengths and diameters to best suit your application. These standard lenses feature double-sided anti-reflection coatings optimized for the near-infrared (NIR) wavelength range to maximize transmittance. They are made from premium materials by established manufacturers and meet strict production tolerances to ensure exceptional quality. All unmounted lens types are also available with a high-quality, black-anodized, engraved aluminum mount.

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Our symmetric-concave lenses are made from high-quality N-BK7 glass and supplied unmounted for flexible integration into your optical system. Their narrow focal-length tolerances ensure consistent system integration and reliable optical performance. With two equal radii of curvature, these lenses deliver precise results for applications requiring controlled beam divergence.

The ARB2 NIR broadband anti-reflection coating ensures high transmission from 725 to 1050 nm. It also provides excellent laser damage resistance and reliable performance in demanding environments.

ZEMAX files are supplied to assist with optical design and simulation. For customized requirements or higher-volume manufacturing, contact us for a quote tailored to your technical specifications.

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Note: f = focal length (object side), f' = focal length (image side) , s = object distance, s' = back focal length, Ø = lens diameter, dm = center thickness, dr = edge thickness, h = primary vertex, h' = sagittal height secondary vertex, F, F' = focal points, H, H' = principal points; Tolerances: focal length f: ±2% image distance s': ±2%

Specifications broadband anti-reflective coating ARB2 NIR:

ARB 2 NIR Reflection Spectrum

  • Guaranteed residual reflection < 0.5 % for angles of incidence 0° ≤ AOI ≤ 15° in the AR range
  • Typical average residual reflection < 0.3 % for angles of incidence 0° ≤ AOI ≤ 15° in the AR range
  • Damage threshold: H∞ > 30 J / cm² for 11 ns laser pulses (s‑on‑1) at 1064 nm and 10 HzAR range typical: 725–1050 nm
  • Design adaptable to the spectral range of 600 nm ≤ λ ≤ 1400 nm and to higher angles of incidence.

Product Biconcave lens; N-BK 7; D=22.4; F=-20 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-100 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-50 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-20 [ARB2-NIR] Biconcave lens; N-BK 7; D=10; F=-10 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-100 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-50 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-40 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-30 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-150 [ARB2-NIR] Biconcave lens; N-BK 7; D=40; F=-500 [ARB2-NIR] Biconcave lens; N-BK 7; D=25.4; F=-200 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-200 [ARB2-NIR] Biconcave lens; N-BK 7; D=25.4; F=-50 [ARB2-NIR]
Optic Size Ø 22.4 mm Ø 22.4 mm Ø 22.4 mm Ø 12.7 mm Ø 10.0 mm Ø 12.7 mm Ø 12.7 mm Ø 22.4 mm Ø 22.4 mm Ø 22.4 mm Ø 40.0 mm Ø 25.4 mm Ø 12.7 mm Ø 25.4 mm
Focal Length (+/-) -20.0 mm -100.0 mm -50.0 mm -20.0 mm -10.0 mm -100.0 mm -50.0 mm -40.0 mm -30.0 mm -150.0 mm -500.0 mm -200.0 mm -200.0 mm -50.0 mm
Optic Substrate N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7
Coating ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR
Optic Center Thickness 1.5 mm 1.5 mm 1.5 mm 1.5 mm 1.0 mm 1.5 mm 1.5 mm 1.5 mm 1.5 mm 1.5 mm 2.0 mm 1.5 mm 1.5 mm 1.5 mm
Radius of Curvature 1 -20.833 mm -104.41 mm -52.33 mm -20.983 mm -10.669 mm -104.41 mm -52.33 mm -41.867 mm -31.396 mm -156.22 mm -523.3 mm -209.83 mm -209.83 mm -52.33 mm
Radius of Curvature 2 20.833 mm 104.41 mm 52.33 mm 20.983 mm 10.669 mm 104.41 mm 52.33 mm 41.867 mm 31.396 mm 156.22 mm 523.3 mm 209.83 mm 209.83 mm 52.33 mm
Tolerance thickness ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.1 mm ± 0.15 mm ± 0.1 mm ± 0.1 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.1 mm ± 0.2 mm
Optic Edge Thickness 7.2 mm 2.7 mm 3.9 mm 3.5 mm 3.5 mm 1.9 mm 2.3 mm 4.5 mm 5.6 mm 2.3 mm 2.8 mm 2.3 mm 1.7 mm 4.6 mm
Optic Centering Accuracy (min,sec) 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 '
Tolerance of optic size - 0.13 mm - 0.13 mm - 0.13 mm - 0.12 mm - 0.09 mm - 0.12 mm - 0.12 mm - 0.13 mm - 0.13 mm - 0.13 mm - 0.16 mm - 0.15 mm - 0.12 mm - 0.15 mm
Height 3.27 mm 0.6 mm 1.21 mm 0.98 mm 1.24 mm 0.19 mm 0.39 mm 1.53 mm 2.07 mm 0.4 mm 0.38 mm 0.39 mm 0.1 mm 1.56 mm
f' at X nm -19.84 mm
-19.98 mm
-20.31 mm 		-100.4 mm
-101.1 mm
-102.78 mm 		-50.2 mm
-50.55 mm
-51.39 mm 		-19.98 mm
-20.12 mm
-20.46 mm 		-10.12 mm
-10.19 mm
-10.36 mm 		-100.4 mm
-101.1 mm
-102.8 mm 		-50.2 mm
-50.55 mm
-51.4 mm 		-40.11 mm
-40.39 mm
-41.07 mm 		-30.02 mm
-30.23 mm
-30.73 mm 		-150.34 mm
-151.4 mm
-153.91 mm 		-504.08 mm
-507.64 mm
-516.06 mm 		-202.0 mm
-203.4 mm
-206.8 mm 		-202.0 mm
-203.4 mm
-206.8 mm 		-50.2 mm
-50.88 mm
-51.4 mm
Coating Specification Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable
Part Number G313205525 G313216525 G313215525 G313373525 G313210525 G313375525 G313374525 G313214525 G313206525 G313217525 G313249525 G313339525 G313376525 G313337525

  • Tight manufacturing tolerances for excellent performance and precision mounting

  • Standard NIR coating: ARB2 NIR (725–1050 nm), designed to maximize transmission across the NIR spectrum

  • Unmounted lenses allow for flexible, custom integration into your optical system

  • ZEMAX files available, enabling easy system design and simulation

ZEMAX Files for Symmetric-Concave Lenses
Product Biconcave lens; N-BK 7; D=22.4; F=-20 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-100 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-50 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-20 [ARB2-NIR] Biconcave lens; N-BK 7; D=10; F=-10 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-100 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-50 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-40 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-30 [ARB2-NIR] Biconcave lens; N-BK 7; D=22.4; F=-150 [ARB2-NIR] Biconcave lens; N-BK 7; D=40; F=-500 [ARB2-NIR] Biconcave lens; N-BK 7; D=25.4; F=-200 [ARB2-NIR] Biconcave lens; N-BK 7; D=12.7; F=-200 [ARB2-NIR] Biconcave lens; N-BK 7; D=25.4; F=-50 [ARB2-NIR]
Optic Size Ø 22.4 mm Ø 22.4 mm Ø 22.4 mm Ø 12.7 mm Ø 10.0 mm Ø 12.7 mm Ø 12.7 mm Ø 22.4 mm Ø 22.4 mm Ø 22.4 mm Ø 40.0 mm Ø 25.4 mm Ø 12.7 mm Ø 25.4 mm
Focal Length (+/-) -20.0 mm -100.0 mm -50.0 mm -20.0 mm -10.0 mm -100.0 mm -50.0 mm -40.0 mm -30.0 mm -150.0 mm -500.0 mm -200.0 mm -200.0 mm -50.0 mm
Optic Substrate N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7 N-BK7
Coating ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR ARB 2 NIR
Optic Center Thickness 1.5 mm 1.5 mm 1.5 mm 1.5 mm 1.0 mm 1.5 mm 1.5 mm 1.5 mm 1.5 mm 1.5 mm 2.0 mm 1.5 mm 1.5 mm 1.5 mm
Radius of Curvature 1 -20.833 mm -104.41 mm -52.33 mm -20.983 mm -10.669 mm -104.41 mm -52.33 mm -41.867 mm -31.396 mm -156.22 mm -523.3 mm -209.83 mm -209.83 mm -52.33 mm
Radius of Curvature 2 20.833 mm 104.41 mm 52.33 mm 20.983 mm 10.669 mm 104.41 mm 52.33 mm 41.867 mm 31.396 mm 156.22 mm 523.3 mm 209.83 mm 209.83 mm 52.33 mm
Tolerance thickness ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.1 mm ± 0.15 mm ± 0.1 mm ± 0.1 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.2 mm ± 0.1 mm ± 0.2 mm
Optic Edge Thickness 7.2 mm 2.7 mm 3.9 mm 3.5 mm 3.5 mm 1.9 mm 2.3 mm 4.5 mm 5.6 mm 2.3 mm 2.8 mm 2.3 mm 1.7 mm 4.6 mm
Optic Centering Accuracy (min,sec) 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 ' 10.0 '
Tolerance of optic size - 0.13 mm - 0.13 mm - 0.13 mm - 0.12 mm - 0.09 mm - 0.12 mm - 0.12 mm - 0.13 mm - 0.13 mm - 0.13 mm - 0.16 mm - 0.15 mm - 0.12 mm - 0.15 mm
Height 3.27 mm 0.6 mm 1.21 mm 0.98 mm 1.24 mm 0.19 mm 0.39 mm 1.53 mm 2.07 mm 0.4 mm 0.38 mm 0.39 mm 0.1 mm 1.56 mm
f' at X nm -19.84 mm
-19.98 mm
-20.31 mm 		-100.4 mm
-101.1 mm
-102.78 mm 		-50.2 mm
-50.55 mm
-51.39 mm 		-19.98 mm
-20.12 mm
-20.46 mm 		-10.12 mm
-10.19 mm
-10.36 mm 		-100.4 mm
-101.1 mm
-102.8 mm 		-50.2 mm
-50.55 mm
-51.4 mm 		-40.11 mm
-40.39 mm
-41.07 mm 		-30.02 mm
-30.23 mm
-30.73 mm 		-150.34 mm
-151.4 mm
-153.91 mm 		-504.08 mm
-507.64 mm
-516.06 mm 		-202.0 mm
-203.4 mm
-206.8 mm 		-202.0 mm
-203.4 mm
-206.8 mm 		-50.2 mm
-50.88 mm
-51.4 mm
Coating Specification Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable Selectable
Part Number G313205525 G313216525 G313215525 G313373525 G313210525 G313375525 G313374525 G313214525 G313206525 G313217525 G313249525 G313339525 G313376525 G313337525

  • Tight manufacturing tolerances for excellent performance and precision mounting

  • Standard NIR coating: ARB2 NIR (725–1050 nm), designed to maximize transmission across the NIR spectrum

  • Unmounted lenses allow for flexible, custom integration into your optical system

  • ZEMAX files available, enabling easy system design and simulation

ZEMAX Files for Symmetric-Concave Lenses
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