Optics Materials

overview

overview

 FOCtek has capability in manufacturing various optical components with a wide variety of optical materials.Selecting a optical material is important since each material has different optical characteristics,such as transmission versus wavelength,index of refracton,thermal,mechanical and chemical characteristics and so on.
Many glass manufacturers offer the same material characteristics under different trade names.Based on availability,we reserve the right to substitute an equivalent glass in our production runs.
Herewith,the most common materials FOCtek used:

Materials Refractive Index (nd) Abbe Number (Vd) Density (g/cm3) Transmission Range (mm) Thermal Expansion Coefficient (10 -6 /K)
N-BK7 1.5168 64.2 2.52 0.33-2.10 7.5
N-SF5 1.6726 32.17 4.08 0.33-2.5 8.2
N-SF11 1.78472 25.76 4.87 0.37-2.5 6.8
Fused Silica 1.45847 67.82 2.2 0.185-2.5 0.54
Pyrex 1.474009 65.38 2.23 0.23-2.7 3.25
CaF2 1.433849 94.99 3.18 0.17-7.8 18.85
Sapphire 1.768234 72.24 3.99 0.18-4.5 5.8
Silicon 3.47   2.33 1.5-8.0 2.6
Borofloat 1.47140 65.41  2.23 0.33-2.60 3.25

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