Newport Corporation | BK 7 Precision Bi-Concave Lenses

BK 7 Precision Bi-Concave Lenses

BK 7 optical glass
≤λ/4 surface irregularity, 40-20 scratch-dig
Broadband or laser line AR coatings available
Standard diameters and focal lengths

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DescriptionSpecifications Models Catalog PDF

Designed to meet the demanding requirements of laser electro-optic applications, Newport's BK 7 precision bi-concave lenses are manufactured from fine annealed optical glass and are polished to tight tolerances using master test plates to ensure minimum wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects.

BK 7 is an excellent material for most visible and near infrared applications. It is the most common optical glass, and it provides great performance at a good value.

Standard diameters from 6.35 mm to 50.8 mm allow for quick, easy mounting in many Newport holders when building experiments or prototypes and complete upgradability from BK 7 to fused silica singlets.

Standard focal lengths provide a systematic approach allowing lenses of different sizes to be interchanged. These singlet lenses are available either uncoated or multi-layer antireflection coated with a choice of broadband coatings or a laser line V-coating for 1064 nm.

Specifications

Focal Length at 589 nm	±1 %
Material	BK 7, grade A, fine annealed optical glass or equivalent
Wavelength	380–2100 nm, uncoated
Surface Accuracy	≤3 fringes (1.5 λ) power, 1/2 fringe (λ/4) irregularity at 546.1 nm over the clear aperture
Clear Aperture	≥central 90% of diameter
Surface Quality	40-20 scratch-dig
Centration, Spherical Lenses	≤3 arc min
Diameter Tolerance	+0/-0.1 mm
Center Thickness (T_c)	2.5 ±0.1 mm
Edge Thickness (T_e)	Nominal Value (see below)
Chamfers	0–0.8 mm face width x 45° ±15°, typical
Antireflection Coating	AR.14, AR.16, and AR.18: broadband, multilayer antireflection coating, R_avg <0.5% AR.33: laser line, multilayer V-coat, R_max <0.25%
Durability	MIL-C-675C, moderate abrasion
Cleaning	Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (Unknown type Newport.Step.Product.XRefElement)
Damage Threshold	AR.14-AR.18: 1000 W/cm², 2 J/cm² with 10 nsec pulses @ 1064 nm, typical AR.33: 2000 W/cm², 3 J/cm² with 10 nsec pulses @ 1064 nm, typical

Model	Diameter [in. (mm)]	Focal Length (mm)	f/#	BFL , FFL (mm)	P₁ (mm)	P₂ (mm)	T_e (mm)	R (mm)
Model	Diameter [in. (mm)]	Focal Length (mm)	f/#	BFL , FFL (mm)	P₁ (mm)	P₂ (mm)	T_e (mm)	R (mm)
KBC013	0.25 (6.35)	-6.3	-0.9	-7.02	0.77	-0.77	3.75	-6.861
KBC010	0.25 (6.35)	-12.5	-1.9	-13.29	0.79	-0.79	3.12	-13.333
KBC028	0.50 (12.7)	-12.5	-0.9	-13.29	0.79	-0.79	5.07	-13.333
KBC025	0.50 (12.7)	-25	-1.9	-25.81	0.81	-0.81	3.76	-26.259
KBC022	0.50 (12.7)	-50	-3.9	-50.81	0.81	-0.81	3.13	-52.103
KBC019	0.50 (12.7)	-75	-5.9	-75.82	0.82	-0.82	2.92	-77.943
KBC016	0.50 (12.7)	-100	-7.8	-100.82	0.82	-0.82	2.82	-103.785
KBC046	1 (25.4)	-25	-0.9	-25.81	0.81	-0.81	7.74	-26.259
KBC043	1 (25.4)	-50	-1.9	-50.81	0.81	-0.81	5.04	-52.103
KBC040	1 (25.4)	-75	-2.9	-75.82	0.82	-0.82	4.19	-77.943
KBC037	1 (25.4)	-100	-3.9	-100.82	0.82	-0.82	3.76	-103.785
KBC034	1 (25.4)	-150	-5.9	-150.82	0.82	-0.82	3.34	-155.466
KBC031	1 (25.4)	-200	-7.8	-200.82	0.82	-0.82	3.13	-207.148
KBC085	2 (50.8)	-75	-1.4	-75.82	0.82	-0.82	9.36	-77.943
KBC082	2 (50.8)	-100	-1.9	-100.82	0.82	-0.82	7.60	-103.785
KBC079	2 (50.8)	-150	-2.9	-150.82	0.82	-0.82	5.88	-155.466
KBC076	2 (50.8)	-200	-3.9	-200.82	0.82	-0.82	5.03	-207.148
KBC073	2 (50.8)	-250	-4.9	-250.82	0.82	-0.82	4.52	-258.824
KBC070	2 (50.8)	-500	-9.8	-500.82	0.82	-0.82	3.51	-517.255

Antireflection coating specifications can be found on Broadband Multilayer Antireflection Coatings and Laser Line Antireflection V-Coatings. Antireflection Coatings

Wavelength Range (nm)	Center Wavelength (nm)	Reflectivity per Surface	Angle of Incidence	Coating Type
430–700	530	R_avg <0.5%	0–15°	AR.14
650–1000	790	R_avg <0.5%, R_max <1.5%	0–15°	AR.16
1000–1550	1210	R_avg <0.5%, R_max <1.5%	0–15°	AR.18
1064	1064	R_max <0.25%	0–15°	AR.33

	Model	Description
	KBC010	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, Uncoated
	KBC010AR.14	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 430-700nm
	KBC010AR.16	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 650-1000nm
	KBC010AR.18	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 1000-1550nm
	KBC010AR.33	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 1064nm
	KBC013	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -6.3 mm EFL, Uncoated
	KBC013AR.14	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -6.3 mm EFL, 430-700nm
	KBC013AR.16	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -6.3 mm EFL, 650-1000nm
	KBC013AR.18	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -6.3 mm EFL, 1000-1550nm
	KBC013AR.33	BK 7 Bi-Concave Lens, 6.35 mm Diameter, -6.3 mm EFL, 1064nm
	KBC016	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -100 mm EFL, Uncoated
	KBC016AR.14	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 430-700nm
	KBC016AR.16	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 650-1000nm
	KBC016AR.18	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 1000-1550nm
	KBC016AR.33	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 1064nm
	KBC019	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -75 mm EFL, Uncoated
	KBC019AR.14	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 430-700nm
	KBC019AR.16	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 650-1000nm
	KBC019AR.18	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 1000-1550nm
	KBC019AR.33	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 1064nm
	KBC022	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -50 mm EFL, Uncoated
	KBC022AR.14	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 430-700nm
	KBC022AR.16	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 650-1000nm
	KBC022AR.18	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 1000-1550nm
	KBC022AR.33	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 1064nm
	KBC025	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -25 mm EFL, Uncoated
	KBC025AR.14	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 430-700nm
	KBC025AR.16	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 650-1000nm
	KBC025AR.18	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 1000-1550nm
	KBC025AR.33	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 1064nm
	KBC028	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -12.5 mm EFL, Uncoated
	KBC028AR.14	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -12.5 mm EFL, 430-700nm
	KBC028AR.16	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -12.5 mm EFL, 650-1000nm
	KBC028AR.18	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -12.5 mm EFL, 1000-1550nm
	KBC028AR.33	BK 7 Bi-Concave Lens, 12.7 mm Diameter, -12.5 mm EFL, 1064nm
	KBC031	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -200 mm EFL, Uncoated
	KBC031AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 430-700nm
	KBC031AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 650-1000nm
	KBC031AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 1000-1550nm
	KBC031AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 1064nm
	KBC034	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -150 mm EFL, Uncoated
	KBC034AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 430-700nm
	KBC034AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 650-1000nm
	KBC034AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 1000-1550nm
	KBC034AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 1064nm
	KBC037	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -100 mm EFL, Uncoated
	KBC037AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 430-700nm
	KBC037AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 650-1000nm
	KBC037AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 1000-1550nm
	KBC037AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 1064nm
	KBC040	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -75 mm EFL, Uncoated
	KBC040AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 430-700nm
	KBC040AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 650-1000nm
	KBC040AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 1000-1550nm
	KBC040AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 1064nm
	KBC043	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -50 mm EFL, Uncoated
	KBC043AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 430-700nm
	KBC043AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 650-1000nm
	KBC043AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 1000-1550nm
	KBC043AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 1064nm
	KBC046	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -25 mm EFL, Uncoated
	KBC046AR.14	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 430-700nm
	KBC046AR.16	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 650-1000nm
	KBC046AR.18	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 1000-1550nm
	KBC046AR.33	BK 7 Bi-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 1064nm
	KBC070	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -500 mm EFL, Uncoated
	KBC070AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 430-700nm
	KBC070AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 650-1000nm
	KBC070AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 1000-1550nm
	KBC070AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 1064nm
	KBC073	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -250 mm EFL, Uncoated
	KBC073AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 430-700nm
	KBC073AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 650-1000nm
	KBC073AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 1000-1550nm
	KBC073AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 1064nm
	KBC076	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -200 mm EFL, Uncoated
	KBC076AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 430-700nm
	KBC076AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 650-1000nm
	KBC076AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 1000-1550nm
	KBC076AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 1064nm
	KBC079	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -150 mm EFL, Uncoated
	KBC079AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 430-700nm
	KBC079AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 650-1000nm
	KBC079AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 1000-1550nm
	KBC079AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 1064nm
	KBC082	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -100 mm EFL, Uncoated
	KBC082AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 430-700nm
	KBC082AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 650-1000nm
	KBC082AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 1000-1550nm
	KBC082AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 1064nm
	KBC085	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -75 mm EFL, Uncoated
	KBC085AR.14	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 430-700nm
	KBC085AR.16	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 650-1000nm
	KBC085AR.18	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 1000-1550nm
	KBC085AR.33	BK 7 Bi-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 1064nm

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