NIR Antireflection Coated N-BK7 Bi-Convex Lenses

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Overview

Our 650-1000 nm N-BK7 precision bi-convex (double-convex) lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion for demanding laser focusing applications.

650-1000 nm anti-reflection coating
High performance 40-20 scratch-dig N-BK7 substrates
Double-Convex shape for focusing applications
Standardized focal lengths across different lens sizes

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Products

Showing 40 of 40 total products

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Compare	Model	Diameter	Effective Focal Length (EFL)	F/#	Availability	Price	Brand
KBX010AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 6.4 mm EFL, 650-1000nm $72.00 Show	KBX010AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 6.4 mm EFL, 650-1000nm	6.35 mm	6.4 mm	1	Show	$72.00	Newport
KBX013AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 12.7 mm EFL, 650-1000nm $62.00 Show	KBX013AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 12.7 mm EFL, 650-1000nm	6.35 mm	12.7 mm	2	Show	$62.00	Newport
KBX019AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 25.4 mm EFL, 650-1000nm $62.00 Show	KBX019AR.16 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 25.4 mm EFL, 650-1000nm	6.35 mm	25.4 mm	4	Show	$62.00	Newport
KBX022AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 12.7 mm EFL, 650-1000nm $62.00 Show	KBX022AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 12.7 mm EFL, 650-1000nm	12.7 mm	12.7 mm	1	Show	$62.00	Newport
KBX025AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 19.0 mm EFL, 650-1000nm $62.00 Show	KBX025AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 19.0 mm EFL, 650-1000nm	12.7 mm	19.0 mm	1.4	Show	$62.00	Newport
KBX028AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 25.4 mm EFL, 650-1000nm $62.00 Show	KBX028AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 25.4 mm EFL, 650-1000nm	12.7 mm	25.4 mm	2	Show	$62.00	Newport
KBX031AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 38.1 mm EFL, 650-1000nm $62.00 Show	KBX031AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 38.1 mm EFL, 650-1000nm	12.7 mm	38.1 mm	3	Show	$62.00	Newport
KBX034AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 50.2 mm EFL, 650-1000nm $62.00 Show	KBX034AR.16 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 50.2 mm EFL, 650-1000nm	12.7 mm	50.2 mm	3.9	Show	$62.00	Newport

Showing 1 to 08 of 40 entries

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Specifications

Lens Shape

Bi-Convex (Double Convex)
Lens Material

N-BK7
Antireflection Coating

650-1000 nm
Coating Type

NIR Multilayer
Coating Code

AR.16
Damage Threshold

7.5 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 material s 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 NIR Antireflection Coatings

Our broadband AR.16 antireflection coating improves the transmission efficiency of these lenses by reducing surface reflections over a 650-1000 nm wavelength range. The NIR 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 10 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.

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 (T_e) specification of the lens and the lens mount to ensure compatibility before purchasing.

Lens Diameter	A-Line™ Lens Mounts	LT Series Lens Tubes	LP Series Lens Positioners	Optics Cage Plus Series
76.2 mm	(M- Model: M-LH-3A Fixed Lens Mount, 3.0 in. (76.2 mm) Diameter, M4 Thread, A-LINE $69.00 Show See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-3A Model: LH-3A Fixed Lens Mount, 3.0 in. (76.2 mm), 8-32 Thread, A-LINE $69.00 Show See Full Product Details Product Series Overview A-Line Fixed Lens Mounts	N/A	N/A	N/A
50.8 mm	(M- Model: M-LH-2A Fixed Lens Mount, Ø2.0 in. (50.8 mm), M4 Thread, A-LINE $36.00 Show See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-2A Model: LH-2A Fixed Lens Mount, 2.0 in. (50.8 mm), 8-32 Thread, A-LINE $36.00 Show See Full Product Details Product Series Overview A-Line Fixed Lens Mounts LH-2N Model: LH-2N Lens Mount, Insertable, 50.8 mm Diameter, A-LINE $42.00 Show See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts	LT20-05 LT20-10 LT20-20 LT20-30	LP-2A LP-2A-XY LP-2A-XYZ	N/A
38.1 mm	(M-) LH-1.5A	LT20 lens tube with LH-2R1.5 adapter	LP-2 lens positioner with LPLH-1.5T adapter	N/A
25.4 mm	(M-) LH-1A LH-1N LH-1XY LH-1TZ-A LH-1TZ	LT10-05 LT10-10 LT10-20 LT10-30	LP-1A LP-1A-XY LP-1A-XYZ	OC1-LH1-S OC1-LH1 OC1-LH1-TZ OC1-LH1-XY OC1-LH1-XYA OC1-LH1-XYC OC1-LH1-XYZ
12.7 mm	(M-) LH-0.5A LH-05N	LT05-05 LT05-10	LP-05A LP-05A-XY LP-05A-XYZ	N/A
6.35 mm	LH-05DB with LH-50R25 adapter	LT05 lens tube with LH-50R25 adapter	LP-05 lens positioner with LPLH-25T adapter	N/A