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1064 nm N-BK7 Bi-Concave LensesKBC010AR.33Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -12.5 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC013AR.33Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -6.3 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC016AR.33Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -100 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC019AR.33Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -75 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC022AR.33Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -50 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC025AR.33Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -25 mm EFL, 1064nm
$85
1064 nm N-BK7 Bi-Concave LensesKBC028AR.33Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -12.5 mm EFL, 1064nm
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$85
1064 nm N-BK7 Bi-Concave LensesKBC031AR.33Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -200 mm EFL, 1064nm
$90
1064 nm N-BK7 Bi-Concave LensesKBC034AR.33Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -150 mm EFL, 1064nm
$90
1064 nm N-BK7 Bi-Concave LensesKBC037AR.33Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -100 mm EFL, 1064nm
$90
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Mounting Options

We offer a full range of optical lens mounts to meet various experimental requirements. Below lists the recommended mounts for spherical lenses of standard sizes. Please see our Lens Mount Guide for additional information.

Note: besides the diameter, please check the Edge Thickness (Te) specification of the lens and the lens mount to ensure compatibility before purchasing. 

Lens Diameter LH-A-GRP
A-Line™ Lens Mounts		 LT_Series_group_update
LT Series Lens Tubes		 OM-multi_axis_lens_pos-S
LP Series Lens Positioners		 optics-cage-plus-S
Optics Cage Plus Series
76.2 mm () N/A N/A N/A
50.8 mm ()





N/A
38.1 mm () LT20 lens tube with
adapter		 LP-2 lens positioner with
adapter		 N/A
25.4 mm ()














12.7 mm ()



N/A
6.35 mm with
adapter		 LT05 lens tube with
adapter		 LP-05 lens positioner with
adapter		 N/A

For non-standard sizes not listed above, check out our variable size lens mounts.

Specifications

  • Lens Shape
    Bi-Concave (Double-Concave)
  • Lens Material
    N-BK7
  • Antireflection Coating
    1064 nm
  • Coating Type
    Laser Line V-Coat Multilayer
  • Coating Code
    AR.33
  • Damage Threshold
    12 J/cm2, 10 ns pulses, 10 Hz at 1064 nm
  • Surface Quality
    40-20 scratch-dig
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ
  • Centration
    ≤3 arc min
  • Chamfers
    0–0.8 mm face width
  • Chamfers Angle/Tolerance
    45° ±15°, typical
  • Focal Length Tolerance
    ±1 %
  • Diameter Tolerance
    +0/-0.1 mm
  • Center Thickness Tolerance
    ±0.1 mm
  • Clear Aperture
    ≥central 90% of diameter
  • Cleaning
    See How to Clean Optics

Features

N-BK7 Substrates for VIS and NIR Applications

N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics. N-BK7 is also relatively hard and shows good scratch resistance. The transmission range for BK 7 is 380 to 2100 nm. It is not recommended for temperature sensitive applications, such as precision mirrors. For more information, refer to our optical materials technical note.

Precision Bi-Concave Lens Surfaces

Our precision N-BK7 bi-concave lenses are polished to tight tolerances minimizing wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. These lenses have a 40-20 scratch-dig surface quality, and a λ/4 surface irregularity. For more information, refer to the optical surfaces technical note.

1064 nm Laser Line Antireflection V-Coating

Our AR.33 laser line V-coating offers the lowest reflectance at 1064 nm for maximum transmission while maintaining high durability and high damage resistance. Valuable laser energy is efficiently transmitted through the plano-convex lens rather than lost to surface reflection and scattering. The trade off to its superior performance is the minimal laser line wavelength range.

Standardized Bi-Concave Focal Lengths

Standard double concave effective focal lengths provide a systematic approach allowing for lenses of different sizes and materials to be interchanged without requiring other changes to your optical system.

Bi-Concave Lens Shape for Beam Expansion

Bi-Concave lenses are the best choice where object and image are at absolute conjugate ratios closer to 1:1 with converging input beam. The output rays appear to be diverging from a virtual image located on the object side of the lens. The distance from this virtual point to the lens is known as the focal length. Similar to the Plano-Concave lenses, the Bi-concave lenses have negative focal lengths, thereby causing collimated incident light to diverge. Bi-Concave lenses have equal radius of curvature on both side of the lens. They are generally used to expand light or increase focal length in existing systems, such as beam expanders and projection systems.

Resources

Technical Notes

Selection Guides

Related Products

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Lens Mounts

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Optic Cleaning Supplies

Uncoated N-BK7 Bi-Concave Lenses

Uncoated N-BK7 Bi-Concave Lenses

1064 nm Antireflection Coated UV Fused Silica Bi-Concave Lenses

1064 nm UVFS Bi-Concave Lenses

1064 nm Antireflection Coated N-BK7 Plano Concave Lenses

1064 nm N-BK7 Plano-Concave Lenses

1064 nm Antireflection Coated UV Fused Silica Plano-Concave Lenses

1064 nm UVFS Plano-Concave Lenses