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BK 7 Precision Plano-Concave Lenses

BK 7 Precision Plano-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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Overview
Specifications
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Designed to meet the demanding requirements of laser electro-optic applications, Newport's BK 7 precision plano-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.

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

Specifications

Focal Length at 589 nm	±1 %
Material	BK 7, grade A, fine annealed optical glass
Wavelength	380–2100 nm, uncoated
Surface Accuracy	1.5 λ (1.5 λ) power, (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) Tolerance	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 (see Care and Cleaning of Optics)
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

Substrate Specifications Table

Model	Diameter (mm)	Focal Length (mm)	f/#	BFL (mm)	FFL (mm)	P₂ (mm)	T_e (mm)	R (mm)
Model	Diameter (mm)	Focal Length (mm)	f/#	BFL (mm)	FFL (mm)	P₂ (mm)	T_e (mm)	R (mm)
KPC013	6.35	-12.5	-1.9	-14.14	-12.50	-1.64	3.17	-6.460
KPC010	6.35	-25	-3.9	-26.64	-25.00	-1.64	2.82	-12.920
KPC025	12.7	-25	-1.9	-26.64	-25.00	-1.64	3.83	-12.920
KPC022	12.7	-50	-3.9	-51.64	-50.00	-1.64	3.14	-25.840
KPC019	12.7	-75	-5.9	-76.64	-75.00	-1.64	2.92	-38.760
KPC016	12.7	-100	-7.8	-101.64	-100.00	-1.64	2.82	-51.680
KPC043	25.4	-25	-0.9	-26.64	-25.00	-1.64	9.40	-12.920
KPC040	25.4	-50	-1.9	-51.64	-50.00	-1.64	5.17	-25.840
KPC037	25.4	-75	-2.9	-76.64	-75.00	-1.64	4.22	-38.760
KPC034	25.4	-100	-3.9	-101.64	-100.00	-1.64	3.78	-51.680
KPC031	25.4	-150	-5.9	-151.64	-150.00	-1.64	3.35	-77.520
KPC028	25.4	-200	-7.8	-201.64	-200.00	-1.64	3.13	-103.360
KPC079	50.8	-75	-1.4	-76.64	-75.00	-1.64	9.96	-38.760
KPC076	50.8	-100	-1.9	-101.64	-100.00	-1.64	7.83	-51.680
KPC073	50.8	-150	-2.9	-151.64	-150.00	-1.64	5.95	-77.520
KPC070	50.8	-200	-3.9	-201.64	-200.00	-1.64	5.06	-103.360
KPC067	50.8	-250	-4.9	-251.64	-250.00	-1.64	4.54	-129.200
KPC064	50.8	-500	-9.8	-501.64	-500.00	-1.64	3.51	-258.400

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	avail raw	Availability	price raw	Price	Qty. MULTI ADD
KPC013	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, Uncoated	0	In Stock	40	$40.00	ADD
KPC013AR.16	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 650-1000nm	0	In Stock	71	$71.00	ADD
KPC016AR.14	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC019AR.18	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC028AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 1064nm	3	3 Weeks	84	$84.00	ADD
KPC037AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC040AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC070	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -200 mm EFL, Uncoated	0	In Stock	59	$59.00	ADD
KPC073AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 430-700nm	0	In Stock	83	$83.00	ADD
KPC076	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -100 mm EFL, Uncoated	0	In Stock	59	$59.00	ADD
KPC016	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -100 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC022AR.14	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC028AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC034AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC040AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 1000-1550nm	0	In Stock	63	$63.00	ADD
KPC043AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC043AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 1064nm	0	In Stock	80	$80.00	ADD
KPC067AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 650-1000nm	0	In Stock	110	$110.00	ADD
KPC070AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 1000-1550nm	99	Call	110	$110.00	ADD
KPC073	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -150 mm EFL, Uncoated	0	In Stock	62	$62.00	ADD
KPC010AR.18	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -25 mm EFL, 1000-1550nm	0	In Stock	63	$63.00	ADD
KPC019AR.16	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 650-1000nm	99	Call	60	$60.00	ADD
KPC025	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -25 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC025AR.14	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC025AR.16	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC025AR.33	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 1064nm	0	In Stock	85	$85.00	ADD
KPC028	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -200 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC064AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 650-1000nm	99	Call	115	$115.00	ADD
KPC070AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 1064nm	99	Call	141	$141.00	ADD
KPC079	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -75 mm EFL, Uncoated	0	In Stock	62	$62.00	ADD
KPC013AR.14	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 430-700nm	0	In Stock	55	$55.00	ADD
KPC016AR.16	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC028AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC031	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -150 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC031AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 1064nm	0	In Stock	85	$85.00	ADD
KPC040AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC040AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -50 mm EFL, 1064nm	0	In Stock	86	$86.00	ADD
KPC043AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC073AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 1000-1550nm	0	In Stock	113	$113.00	ADD
KPC076AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 1064nm	0	In Stock	141	$141.00	ADD
KPC010	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -25 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC010AR.14	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -25 mm EFL, 430-700nm	0	In Stock	52	$52.00	ADD
KPC010AR.16	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -25 mm EFL, 650-1000nm	99	Call	63	$63.00	ADD
KPC022AR.33	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 1064nm	0	In Stock	80	$80.00	ADD
KPC025AR.18	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -25 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC031AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC010AR.33	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -25 mm EFL, 1064nm	99	Call	80	$80.00	ADD
KPC019	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -75 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC019AR.14	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC019AR.33	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -75 mm EFL, 1064nm	99	Call	80	$80.00	ADD
KPC022AR.18	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC031AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC040	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -50 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC064	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -500 mm EFL, Uncoated	0	In Stock	62	$62.00	ADD
KPC064AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 430-700nm	6	6 Weeks	86	$86.00	ADD
KPC067AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 1000-1550nm	99	Call	110	$110.00	ADD
KPC079AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 1064nm	0	In Stock	141	$141.00	ADD
KPC034	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -100 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC034AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 1064nm	0	In Stock	83	$83.00	ADD
KPC037AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 1000-1550nm	0	In Stock	63	$63.00	ADD
KPC073AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 650-1000nm	0	In Stock	109	$109.00	ADD
KPC079AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 1000-1550nm	0	In Stock	110	$110.00	ADD
KPC013AR.18	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 1000-1550nm	99	Call	71	$71.00	ADD
KPC013AR.33	BK 7 Plano-Concave Lens, 6.35 mm Diameter, -12.5 mm EFL, 1064nm	0	In Stock	90	$90.00	ADD
KPC022	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -50 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC022AR.16	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -50 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC031AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -150 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC034AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 650-1000nm	0	In Stock	60	$60.00	ADD
KPC037	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -75 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC037AR.16	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 650-1000nm	5	5 Weeks	60	$60.00	ADD
KPC043	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -25 mm EFL, Uncoated	0	In Stock	35	$35.00	ADD
KPC043AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -25 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC064AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 1000-1550nm	99	Call	115	$115.00	ADD
KPC064AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -500 mm EFL, 1064nm	99	Call	141	$141.00	ADD
KPC067AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 430-700nm	0	In Stock	81	$81.00	ADD
KPC067AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -250 mm EFL, 1064nm	0	In Stock	141	$141.00	ADD
KPC070AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 650-1000nm	0	In Stock	110	$110.00	ADD
KPC079AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 430-700nm	6	6 Weeks	84	$84.00	ADD
KPC016AR.18	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC016AR.33	BK 7 Plano-Concave Lens, 12.7 mm Diameter, -100 mm EFL, 1064nm	99	Call	80	$80.00	ADD
KPC028AR.18	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -200 mm EFL, 1000-1550nm	0	In Stock	60	$60.00	ADD
KPC034AR.14	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -100 mm EFL, 430-700nm	0	In Stock	50	$50.00	ADD
KPC037AR.33	BK 7 Plano-Concave Lens, 25.4 mm Diameter, -75 mm EFL, 1064nm	0	In Stock	80	$80.00	ADD
KPC067	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -250 mm EFL, Uncoated	0	In Stock	59	$59.00	ADD
KPC070AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -200 mm EFL, 430-700nm	0	In Stock	84	$84.00	ADD
KPC073AR.33	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -150 mm EFL, 1064nm	0	In Stock	141	$141.00	ADD
KPC076AR.14	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 430-700nm	99	Call	84	$84.00	ADD
KPC076AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 650-1000nm	0	In Stock	110	$110.00	ADD
KPC076AR.18	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -100 mm EFL, 1000-1550nm	99	Call	110	$110.00	ADD
KPC079AR.16	BK 7 Plano-Concave Lens, 50.8 mm Diameter, -75 mm EFL, 650-1000nm	0	In Stock	110	$110.00	ADD

Newport Resource e-Catalogs *

*e-Catalog pages include the most current information available at the time of printing.

BK 7 Precision Plano-Concave Lenses

Specifications

Substrate Specifications Table

Antireflection Coatings

Newport Resource e-Catalogs *

Newport Family of Brands