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IR N-BK7 Bi-Convex LensesKBX010AR.18Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 6.4 mm EFL, 1000-1550nm
$74
IR N-BK7 Bi-Convex LensesKBX013AR.18Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 12.7 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX019AR.18Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 25.4 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX022AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 12.7 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX025AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 19.0 mm EFL, 1000-1550nm
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$64
IR N-BK7 Bi-Convex LensesKBX028AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 25.4 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX031AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 38.1 mm EFL, 1000-1550nm
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$64
IR N-BK7 Bi-Convex LensesKBX034AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 50.2 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX037AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 62.9 mm EFL, 1000-1550nm
$64
IR N-BK7 Bi-Convex LensesKBX040AR.18Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 75.6 mm EFL, 1000-1550nm
$64
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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-Convex (Double Convex)
  • Lens Material
    N-BK7
  • Antireflection Coating
    1000-1550 nm
  • Coating Type
    IR Multilayer
  • Coating Code
    AR.18
  • Damage Threshold
    7.5 J/cm2, 10 ns pulses, 20 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 Double Convex Lens Surfaces

Our precision bi-convex 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.

Broadband Multilayer IR Antireflection Coating

Our broadband AR.18 antireflection coating improves the transmission efficiency of these lenses by reducing surface reflections over a 1000-1550 nm wavelength range. The IR AR multi-layer coating improves the performance over uncoated surfaces. It features a damage threshold of 7.5 J/cm‌2 for 10 ns pulses at 20 Hz and 1064 nm.

Standardized Bi-Convex Focal Lengths

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

Bi-Convex Lens Shape for Focusing

Bi-Convex lenses are the best choice when the object and image are at equal or near equal distance from the lens. When the object and image distance are equal (1:1 magnification), not only is spherical aberration minimized, but also coma, distortion, and chromatic aberration are identically canceled due to the symmetry. Bi-convex lenses function similarly to plano-convex lenses in that they have a positive focal length, and focus parallel rays of light to a point. Both surface are spherical and have the same radius of curvature, thereby minimizing spherical aberration. As a guideline, bi-convex lenses perform within minimum aberration at conjugate ratios between 5:1 and 1:5. Outside this magnification range, plano-convex lenses are usually more suitable.

Resources

Technical Notes

Selection Guides

Related Products

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Lens Mounts

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Optic Cleaning Supplies

Uncoated N-BK7 Bi-Convex Lenses

Uncoated N-BK7 Bi-Convex Lenses

collection of uv fused silica bi-convex spherical lenses

Uncoated UVFS Bi-Convex Lenses

IR Antireflection Coated N-BK7 Plano-Convex Lenses

IR N-BK7 Plano-Convex Lenses