Low Cost Spherical Lens BK7 BiConcave

S-SLB-B-N

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SKU

S-SLB-B-N

This lower cost product offering of Plano Convex Lenses has only minimal reduction in quality and is perfect for most applications. It can be used in an optical systems such as observation or lighting applications when the higher surface quality Plano BiConvex Lens (SLB-B-P, SLB-B-N) is not required.

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Name Diameter φD Focal length Delivery Price Add to cart

Reasonable Concave Lens BK7 10mm Diameter -9.7mm Focal Length 750 - 1550nm
S-SLB-10B-10NIR2

10mm

−9.7mm

6-12 weeks

$38.76

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	750 - 1550nm
Diameter φD	φ10mm
Focal length f	−9.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm

Reasonable Concave Lens BK7 10mm Diameter -14.7mm Focal Length 633 - 1064nm
S-SLB-15B-15NIR1

10mm

−14.7mm

6-12 weeks

$41.82

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (633 - 1064nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	633 - 1064nm
Diameter φD	φ10mm
Focal length f	−14.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm

Reasonable Concave Lens BK7 20mm Diameter -49.7mm Focal Length Uncoated
S-SLB-20B-50N

20mm

−49.7mm

6-12 weeks

$23.46

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Uncoated
Clear aperture	S-SLB-N : 90% of the diameter S-SLB-B-N : 85% of the diameter )
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−49.7mm
Edge thickness te	3.9mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.90mm

Reasonable Concave Lens BK7 20mm Diameter -49.7mm Focal Length 400 - 700nm
S-SLB-20B-50NM

20mm

−49.7mm

6-12 weeks

$42.33

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (400 - 700nm)
Transmmittance	> Average 99%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ20mm
Focal length f	−49.7mm
Edge thickness te	3.9mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.90mm

Reasonable Concave Lens BK7 30mm Diameter -99.7mm Focal Length 750 - 1550nm
S-SLB-30B-100NIR2

30mm

−99.7mm

6-12 weeks

$46.41

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	750 - 1550nm
Diameter φD	φ30mm
Focal length f	−99.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.80mm

Reasonable Concave Lens BK7 10mm Diameter -9.7mm Focal Length Uncoated
S-SLB-10B-10N

10mm

−9.7mm

6-12 weeks

$20.91

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Uncoated
Clear aperture	S-SLB-N : 90% of the diameter S-SLB-B-N : 85% of the diameter )
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−9.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm

Reasonable Concave Lens BK7 10mm Diameter -9.7mm Focal Length 400 - 700nm
S-SLB-10B-10NM

10mm

−9.7mm

6-12 weeks

$38.76

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (400 - 700nm)
Transmmittance	> Average 99%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ10mm
Focal length f	−9.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm

Reasonable Concave Lens BK7 10mm Diameter -14.7mm Focal Length 750 - 1550nm
S-SLB-15B-15NIR2

10mm

−14.7mm

6-12 weeks

$41.82

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	750 - 1550nm
Diameter φD	φ10mm
Focal length f	−14.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm

Reasonable Concave Lens BK7 20mm Diameter -49.7mm Focal Length 633 - 1064nm
S-SLB-20B-50NIR1

20mm

−49.7mm

6-12 weeks

$42.33

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (633 - 1064nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	633 - 1064nm
Diameter φD	φ20mm
Focal length f	−49.7mm
Edge thickness te	3.9mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.90mm

Reasonable Concave Lens BK7 30mm Diameter -99.7mm Focal Length Uncoated
S-SLB-30B-100N

30mm

−99.7mm

6-12 weeks

$22.95

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Uncoated
Clear aperture	S-SLB-N : 90% of the diameter S-SLB-B-N : 85% of the diameter )
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−99.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.80mm

Reasonable Concave Lens BK7 30mm Diameter -99.7mm Focal Length 400 - 700nm
S-SLB-30B-100NM

30mm

−99.7mm

6-12 weeks

$46.41

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (400 - 700nm)
Transmmittance	> Average 99%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ30mm
Focal length f	−99.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.80mm

Reasonable Concave Lens BK7 10mm Diameter -9.7mm Focal Length 633 - 1064nm
S-SLB-10B-10NIR1

10mm

−9.7mm

6-12 weeks

$38.76

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (633 - 1064nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	633 - 1064nm
Diameter φD	φ10mm
Focal length f	−9.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm

Reasonable Concave Lens BK7 10mm Diameter -14.7mm Focal Length Uncoated
S-SLB-15B-15N

10mm

−14.7mm

6-12 weeks

$23.46

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Uncoated
Clear aperture	S-SLB-N : 90% of the diameter S-SLB-B-N : 85% of the diameter )
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−14.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm

Reasonable Concave Lens BK7 10mm Diameter -14.7mm Focal Length 400 - 700nm
S-SLB-15B-15NM

10mm

−14.7mm

6-12 weeks

$41.82

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (400 - 700nm)
Transmmittance	> Average 99%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ10mm
Focal length f	−14.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm

Reasonable Concave Lens BK7 20mm Diameter -49.7mm Focal Length 750 - 1550nm
S-SLB-20B-50NIR2

20mm

−49.7mm

6-12 weeks

$42.33

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	750 - 1550nm
Diameter φD	φ20mm
Focal length f	−49.7mm
Edge thickness te	3.9mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.90mm

Reasonable Concave Lens BK7 30mm Diameter -99.7mm Focal Length 633 - 1064nm
S-SLB-30B-100NIR1

30mm

−99.7mm

6-12 weeks

$46.41

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Centration	＜3′
Coating	Broadband Multilayer antireflection coating (633 - 1064nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	85% of the diameter
Surface Quality (Scratch-Dig)	60-40
Wavelength range of Antireflection Coating	633 - 1064nm
Diameter φD	φ30mm
Focal length f	−99.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.80mm

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◦It has the same specification of Plano Convex Lens (SLB-B-P or SLB-B-N) except the surface quality and is ideal for experiments and applications where high-precision is not required.
◦There are two types of lens offer, a Plano convex lens with low spherical aberration and a biconvex lens that is used to shorten the focal length.
◦In addition to uncoated products, there are three types of anti-reflection coating for visible, near-infrared, and infrared.