Visible Antireflection Coated N-BK7 Bi-Concave Lenses

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Overview

Our 430-700 nm antireflection coated N-BK7 precision bi-concave (double-concave) lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion for demanding laser collimating applications.

430-700 nm anti-reflection coating
High performance 40-20 scratch-dig N-BK7 substrates
Double-Concave shape for beam expansion applications
Standardized focal lengths across different lens sizes

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Products

Showing 19 of 19 total products

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Compare	Model	Diameter	Effective Focal Length (EFL)	F/#	Availability	Price	Brand
KBC010AR.14 Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -12.5 mm EFL, 430-700nm $60.00 In Stock	KBC010AR.14 Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -12.5 mm EFL, 430-700nm	6.35 mm	-12.5 mm	-1.9	In Stock	$60.00	Newport
KBC013AR.14 Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -6.3 mm EFL, 430-700nm $60.00 In Stock	KBC013AR.14 Bi-Concave Lens, N-BK7, 6.35 mm Diameter, -6.3 mm EFL, 430-700nm	6.35 mm	-6.3 mm	-0.9	In Stock	$60.00	Newport
KBC016AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -100 mm EFL, 430-700nm $60.00 In Stock	KBC016AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -100 mm EFL, 430-700nm	12.7 mm	-100 mm	-7.8	In Stock	$60.00	Newport
KBC019AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -75 mm EFL, 430-700nm $60.00 In Stock	KBC019AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -75 mm EFL, 430-700nm	12.7 mm	-75 mm	-5.9	In Stock	$60.00	Newport
KBC022AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -50 mm EFL, 430-700nm $60.00 In Stock	KBC022AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -50 mm EFL, 430-700nm	12.7 mm	-50 mm	-3.9	In Stock	$60.00	Newport
KBC025AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -25 mm EFL, 430-700nm $60.00 In Stock	KBC025AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -25 mm EFL, 430-700nm	12.7 mm	-25 mm	-1.9	In Stock	$60.00	Newport
KBC028AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -12.5 mm EFL, 430-700nm $60.00 In Stock	KBC028AR.14 Bi-Concave Lens, N-BK7, 12.7 mm Diameter, -12.5 mm EFL, 430-700nm	12.7 mm	-12.5 mm	-0.9	In Stock	$60.00	Newport
KBC031AR.14 Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -200 mm EFL, 430-700nm $62.00 In Stock	KBC031AR.14 Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -200 mm EFL, 430-700nm	25.4 mm	-200 mm	-7.8	In Stock	$62.00	Newport

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Specifications

Lens Shape

Bi-Concave (Double Concave)
Lens Material

N-BK7
Antireflection Coating

430-700 nm
Coating Type

Visible Multilayer
Coating Code

AR.14
Damage Threshold

7.5 J/cm², 10 ns pulses, 10 Hz at 532 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 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.

AR.14 Broadband Visible Antireflection Coating

Our AR.14 broadband multilayer antireflection coating markedly improves the transmission efficiency of these lenses by reducing surface reflections over a 430-700 nm wavelength range. This visible AR coating performs effectively for multiple visible wavelengths and tunable lasers eliminating the need for several sets of optics.

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.

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 In Stock 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 1 Week 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 In Stock 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 In Stock 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 In Stock See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts	LT20-05 Model: LT20-05 Lens Tube, 2 inch LT Series, 1/2 inch length $36.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-10 Model: LT20-10 Lens Tube, 2 inch LT Series, 1 inch length $39.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-20 Model: LT20-20 Lens Tube, 2 inch LT Series, 2 inch length $42.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT20-30 Model: LT20-30 Lens Tube, 2 inch dia. LT Series, 3 inch length $47.00 In Stock See Full Product Details Product Series Overview Lens Tubes	LP-2A Model: LP-2A Precision Lens Positioner, 2.0 in., 100 TPI XYθXθY, 80 TPI Z $1,088.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-2A-XY Model: LP-2A-XY Precision Lens Positioner, 2.0 in. Diameter, 100 TPI XY $702.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-2A-XYZ Model: LP-2A-XYZ Precision Lens Positioner, 2.0 in., 100 TPI XY, 80 TPI Z $785.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners	N/A
38.1 mm	(M- Model: M-LH-1.5A Fixed Lens Mount, 1.5 in. (38.1 mm) Diameter, M4 Thread, A-LINE $34.00 3 Weeks See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-1.5A Model: LH-1.5A Fixed Lens Mount, 1.5 in. (38.1 mm) Diameter, 8-32 Thread, A-LINE $34.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts	LT20 lens tube with LH-2R1.5 Model: LH-2R1.5 Lens Adaptor, 2.0 in. Mount to 1.5 in. Diameter Lens, A-LINE $31.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts adapter	LP-2 lens positioner with LPLH-1.5T Model: LPLH-1.5T Optic Holder, 1.5 in. Diameter, 2.063-20 Thread, For LP-2A Series $97.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners adapter	N/A
25.4 mm	(M- Model: M-LH-1A Fixed Lens Mount, Ø1.0 in. (25.4 mm), M4 Thread, A-LINE $20.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-1A Model: LH-1A Fixed Lens Mount, 1.0 in. (25.4 mm) Diameter, 8-32 Thread, A-LINE $20.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts LH-1N Model: LH-1N Lens Mount, Insertable, 25.4 mm Diameter, A-LINE $29.00 In Stock See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts LH-1XY Model: LH-1XY XY Lens Mount, Insertable, 25.4 mm, A-LINE $185.00 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts LH-1TZ-A Model: LH-1TZ-A Fine Focusing Lens Mount, 1.0 in., Screw Drive, 8-32 and M4, A-LINE $230.00 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts LH-1TZ Model: LH-1TZ Fine Focusing Lens Mount, 1.0 in., Micrometer Drive, 8-32 and M4, A-LINE $258.00 In Stock See Full Product Details Product Series Overview A-Line Adjustable Optic Mounts	LT10-05 Model: LT10-05 Lens Tube, 1 inch LT Series, 1/2 inch length $20.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-10 Model: LT10-10 Lens Tube, 1 inch LT Series, 1 inch length $23.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-20 Model: LT10-20 Lens Tube, 1 inch LT Series, 2 inch length $24.00 In Stock See Full Product Details Product Series Overview Lens Tubes LT10-30 Model: LT10-30 Lens Tube, 1 inch LT Series, 3 inch length $36.00 In Stock See Full Product Details Product Series Overview Lens Tubes	LP-1A Model: LP-05A Precision Lens Positioner, 0.5 in., 100 TPI XYθXθY, 80 TPI Z $749.00 4 Weeks See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-1A-XY Model: LP-1A-XY Precision Lens Positioner, 1.0 in. Diameter, 100 TPI XY $600.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-1A-XYZ Model: LP-1A-XYZ Precision Lens Positioner, 1.0 in., 100 TPI XY, 80 TPI Z $722.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners	OC1-LH1-S Model: OC1-LH1-S Lens Mount, Standard, 1 in. Diameter, Optics Cage Plus $38.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Fixed Optic Mounts OC1-LH1 Model: OC1-LH1 Lens Mount, Insertable, 1 in. Diameter, Optics Cage Plus $24.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Fixed Optic Mounts OC1-LH1-TZ Model: OC1-LH1-TZ Lens Mount, Insertable, 1 in. Diameter, Optics Cage Plus, Requires OC1-TZ $56.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Adjustable Mounts OC1-LH1-XY Model: OC1-LH1-XY Adjustable Lens Mount, Insertable, XY Fine, 25.4 mm Diameter, 1 in. Optics Cage Plus $243.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Adjustable Mounts OC1-LH1-XYA Model: OC1-LH1-XYA Adjustable Lens Mount, Insertable, XYθXθY Fine, 25.4 mm Diameter, 1 in. Optics Cage Plus $285.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Adjustable Mounts OC1-LH1-XYC Model: OC1-LH1-XYC Adjustable Lens Mount, Insertable, XY Coarse, 25.4 mm Diameter, 1 in. Optics Cage Plus $100.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Adjustable Mounts OC1-LH1-XYZ Model: OC1-LH1-XYZ Adjustable Lens Mount, Insertable, XYZ Fine, 25.4 mm Diameter, 1 in. Optics Cage Plus $433.00 In Stock See Full Product Details Product Series Overview Optics Cage Plus Adjustable Mounts
12.7 mm	(M- Model: M-LH-0.5A Fixed Lens Mount, 0.50 in. (12.7 mm) Diameter, M4 Thread, A-LINE $20.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts ) LH-0.5A Model: LH-0.5A Fixed Lens Mount, 0.50 in. (12.7 mm) Diameter, 8-32 Thread, A-LINE $20.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts LH-05N Model: LH-05N Lens Mount, Insertable, 12.7 mm Diameter, A-LINE $26.00 In Stock See Full Product Details Product Series Overview A-Line™ Insertable Fixed Lens Mounts	LT05-05 Model: LT05-05 Lens Tube, 1/2 inch diameter lenses, 1/2 inch length $19.40 In Stock See Full Product Details Product Series Overview Lens Tubes LT05-10 Model: LT05-10 Lens Tube, 1/2 inch diameter lenses, 1 inch length $21.00 In Stock See Full Product Details Product Series Overview Lens Tubes	LP-05A Model: LP-05A Precision Lens Positioner, 0.5 in., 100 TPI XYθXθY, 80 TPI Z $749.00 4 Weeks See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-05A-XY Model: LP-05A-XY Precision Lens Positioner, 0.5 in. Diameter, 100 TPI XY $456.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners LP-05A-XYZ Model: LP-05A-XYZ Precision Lens Positioner, 0.5 in., 100 TPI XY, 80 TPI Z $544.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners	N/A
6.35 mm	LH-05DB Model: LH-05DB Mirror Mount, Fixed, 12.7 mm Diameter, 8-32 Thread, A-LINE $20.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Optic Mounts with LH-50R25 Model: LH-50R25 Lens Adaptor, 0.5 in. Mount to 0.25 in. Diameter Lens, A-LINE $23.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts adapter	LT05 lens tube with LH-50R25 Model: LH-50R25 Lens Adaptor, 0.5 in. Mount to 0.25 in. Diameter Lens, A-LINE $23.00 In Stock See Full Product Details Product Series Overview A-Line Fixed Lens Mounts adapter	LP-05 lens positioner with LPLH-25T Model: LPLH-25T Optic Holder, 0.25 in. Diameter, 0.875-20 Thread, For LP-05A Series $43.00 In Stock See Full Product Details Product Series Overview Precision Multi-Axis Lens Positioners adapter	N/A