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Interferometers  ::  Sapphire optics  ::  Optical coatings

 
 
 

Al2O3 sapphire Ge germanium GaAs gallium arsenide Si silicon LiF lithium fluoride
CaF2 calcium fluoride BaF2 barium fluoride MgF2 magnesium fluoride NaCl sodium chloride KCl potassium chloride
KBr potassium bromide ZnSe Sublimate zinc selenide ZnSe CVD zinc selenide ZnS zinc sulfide Quartz Crystalline ( SiO2 )
Zerodur® BK7 Fused Silica UV Grade (SiO2) Fused Silica IR Grade (SiO2)  

BK7 SCHOTT GLASS BK7

Properties:   Optical • Thermal • Mechanical 
 
Refractive Index at ne
1.51872
Refractive Index at nF
1.52283
Thermal Coefficient of Refractive Index at l=0.546 microns,îÑ-1 for 0¸+20îÑ
2.8• 10-6
Transmission Range, microns (thickness 10ìì)
0.35¸2
    Transmittance ti(l) vs. wavelength l  BK7
 

 
 Internal Transmittance ti(l) vs. 
wavelength l
l,ìêì
ti(l)
0.310
0.59 
0.320
 0.81
0.350
 0.986
0.365
0.994
0.370
0.995
0.380
0.996
0.390
0.998
 0.400
0.998
0.420
0.998
0.460
0.999
0.500
0.999
0.700
0.999
1.060
0.999
1.530
0.997
1.970
0.968
 2.325
0.89
 
Refractive Index n vs.
wavelength l
l,ìêì
n(l)
0.365
 1.53626
0.4047
 1.53024
0.4358
 1.52669
0.4800
1.52283
0.4861
1.52238 
0.5461
1.51872 
0.5876
1.51680
0.5893
1.51673
0.6328
1.51509
0.6438
1.51472
0.6563
1.51432
0.7065
1.51289
0.8521
1.50981
1.0140
1.50731
1.0600
1.50669
1.5296
1.50094
1.9700
1.49500
2.3254
1.48929
Thermal Linear Expansion  at, îÑ-1 for -30¸+70îÑ
7.1• 10-6
Thermal Conductivity, W/(m • îÑ) at 20 îÑ
1.114
Specific Heat Capacity, J/(kg • îÑ) 
858.0
Melting Point, îÑ
559
Density, g/cm3 at 20  îÑ
2.51
Poisson Ratio
0.206
Young Modulus (Å), Pa
8.1• 1010

"Opto-Technological Laboratory" produces mirrors, lenses, windows, prisms, wedges, ball lenses, cylindrical lenses and others optical components according to customers’ specifications and drawings out of BK7 schott glass.

 
Al2O3 sapphire Ge germanium GaAs gallium arsenide Si silicon LiF lithium fluoride
CaF2 calcium fluoride BaF2 barium fluoride MgF2 magnesium fluoride NaCl sodium chloride KCl potassium chloride
KBr potassium bromide ZnSe Sublimate zinc selenide ZnSe CVD zinc selenide ZnS zinc sulfide Quartz Crystalline ( SiO2 )
Zerodur® BK7 Fused Silica UV Grade (SiO2) Fused Silica IR Grade (SiO2)  
 

 
  Joint Stock Company "Opto - Technological Laboratory"
  9,Mendeleevskaja ul., Saint-Petersburg, Russia
  E-mail: sales@optotl.ru		 :: Main :: Materials :: References :: Contacts :: Founders  ::

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