• Your shopping cart is empty!

BK7 Windows/Rods

BK7 Windows/Rods

BK7 is borosilicate crown optical glass with an excellent physical and chemical properties for applications in visible and near IR.  Large BK7 glass with high homogeneity, low bubble and inclusion content can be produced at a large quantity and at low cost, making it the standard material for optical components (uncoated or coated) in visible and IR.

Newlight Photonics offers circular/rectangular BK7 windows or rods with thickness from 0.15 mm to 150 mm. 

Various high quality HR, AR, and partial reflective coatings are available upon request.
 

material
thickness
coating
Product Compare (0)
Model Name material thickness coating Price Availability Action
BKG1010 BK7 window, Dia 1", 1.0mm thick, uncoated BK7 1.0mm Uncoated USD$69.00 Out Of Stock
BKG1020 BK7 window, Dia 1", 2.0mm thick, uncoated BK7 2.0mm Uncoated Ask Out Of Stock
BKG1040 BK7 window, Dia 1", 4.0mm thick, uncoated BK7 4.0mm Uncoated Ask Out Of Stock
BKW1041 BK7 window, Aperture 25.4x25.4mm, 4.1mm thick, uncoated BK7 4.1mm Uncoated USD$89.00 Out Of Stock
BKW1041-BBAR400/700 BK7 window, Aperture 25.4x25.4mm, 4.1mm thick, Broadband AR coated @400-700nm BK7 4.1mm BBAR@(400-700)nm Ask Out Of Stock
BKG0760-BBAR400/700 BK7 window, Dia 0.75" (19.0 mm), 6.0mm thick, AR coated @ 400-700 nm BK7 6.0mm BBAR@(400-700)nm Ask Out Of Stock
BKG0760-AR916 BK7 window, Dia 0.75" (19.0 mm), 6.0mm thick, AR coated @ 916 nm BK7 6.0mm AR@916nm USD$199.00 Out Of Stock
BKG1100 BK7 window, Dia 1", 10.0mm thick, uncoated BK7 10.0mm Uncoated USD$99.00
BKG1100-AR1800 BK7 window, Dia 1", 10.0mm thick, AR@1800nm on both surfaces BK7 10.0mm AR@1800nm Ask
BKG5188-BBAR800/880 N-BK7 rods, aperture: Dia 5(+/-0.1)mm, Length 18.8(+/-0.1)mm, Broadband AR coating with R<1% @ 800-880nm each face BK7 18.8mm BBAR@(800-880)nm Ask In Stock
BKG1200 BK7 window, Dia 1", 20.0mm thick, uncoated BK7 20.0mm Uncoated USD$99.00 Out Of Stock
BKG1200-AR1800 BK7 window, Dia 1", 20.0mm thick, AR@1800nm on both surfaces BK7 20.0mm AR@1800nm Ask Out Of Stock
BKG1300 BK7 window, Dia 1", 30.0mm thick, uncoated BK7 30.0mm Uncoated USD$109.00 Out Of Stock
BKG1300-AR1800 BK7 window, Dia 1", 30.0mm thick, AR@1800nm on both surfaces BK7 30.0mm AR@1800nm Ask Out Of Stock
BKG1500 BK7 window, Dia 1", 50.0mm thick, uncoated BK7 50.0mm Uncoated Ask Out Of Stock
Showing 1 to 15 of 17 (2 Pages)


Basic Properties of BK7 and N-BK7 Glass:
 

 

 BK7, N-BK7
Transparency Range 360 - 2000 nm
Density 2.51 g/cm3
Thermo-Optic
Coefficients (dn/dT)		 2.3 x 10-6 /oC
Optical Homogeneity Δn < 10-6 /cm
Mohs Hardness  ~ 6 
Thermal Conductivity 1.1 W/m/K
Thermal Expansion
Coefficients		 8 x 10-6 /K (BK7), 7.1 x 10-6 /K (N-BK7)
Sellmeier Equations
(λ in µm)		 n2=1+1.03961λ2/(λ2- 0.0060007)+0.23179λ2/(λ2-0.020018)+1.01047λ2/(λ2-103.5600)
Wavelength(nm) Index of Refraction
400 1.5308
532 1.5194
632.8 1.5150
1064 1.5066



Transmission curve:
material-bk7.GIF (10870 bytes)

 

 


Specifications of BK7 Windows:
 

Dimension Tolerance: Diameter:  ± 0.1 mm,
Thickness:  ± 0.1 mm (T=<5mm), +0.5/-0.1 mm (T>5mm) 
Clear Aperture: > 85%
Surface Quality: 20/10 Scratch and Dig
Parallelism: < 1 arc min
Flatness: λ/8 @ 632.8 nm for T>=2mm
Transmission Wavefront Distortion: < λ/8 @ 632.8 nm for T=<25mm 
< λ/8 @ 632.8 nm per 25mm for T>25mm
Bevel: < 0.25 mm X 45°
 

N-BK7, the ROHS version of standard BK7 may be used for the windows without notice.  N-BK7 will always be used for EU customers in compliance with the RoHS regulations. Please let us know if N-BK7 and BK7 have to be distinguished for your applications.

Coatings:

Various high quality HR, AR, Broadband AR (BBAR) and partial reflective (PR) coatings are also available upon request.

AR Coatings: R<0.2% at the central wavelength
HR Coatings: R>99.6% at the central wavelength
PR Coatings: R=3-95% at the specified wavelength
Broadband AR: R<1% over the specified range