OPTICS CRYSTALS LASERS
   
 
Material - Silicon (Si)

Monocrystalline Silicon Si is used as optical windows usually in (3 - 5) micron band and as substrates for production of optical mirrors.

Silicon Si is frequently used for laser mirrors because of its high thermal conductivity and low density. Silicon Si monocrystal is also useful as a transmitter in the 20 micron range. Si large blocks with polished faces are also employed as targets in neutron physics experiments.

Silicon is grown by Czochralski pulling techniques (CZ) and contains some oxygen which causes an absorption band at 5.8, 9.1 and 19.4 microns. To avoid this, Si monocrystalline material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 Ohm*cm) for best transmission above 10 microns. Silicon has a further pass band 30 to 100 microns which is effective only in very high resistivity material.

Crystaltechno Ltd. manufactures from Silicon Si the following optics: blanks, windows, prisms, wedges, lenses and mirrors. These products are used for infrared applications. Maximum diameter of Si-Cz optics - up to 300 mm, maximum diameter of Si-Fz optics - up to 100 mm..

Spectral Transmittance of FZ Silicon Uncoated Polished Window thickness 5mm for range (2.5 - 25) microns, (2.5 - 4.3) kOhm*cm Spectral Transmittance of CZ-Silicon Uncoated Polished Window thickness 6.8 mm for range (2.5 - 25) microns

Crystaltechno Ltd. offers the manufacturing of silicon optics (in detail please see Catalog):

Perhaps you will find required Silicon Si optics at our stock, please see item Optical Crystals.

BASE PROPERTIES of Silicon Si

PARAMETER VALUE
OPTICAL  
  Transmission Range   1.2 to 15 microns  
  Refractive Index   3.4223 at 5 microns  
  Reflection Loss   51.0% at 5 µm (2 surfaces)  
  dn/dT   160 x 10-6/K  
  dN/dµ = 0   10.4µm  
  Index of Absorption   1 x 10-3 cm-1 at 3 microns  
PHYSICAL  
  Density   2.33 g/cm3  
  Melting Point   1420° C  
  Thermal Conductivity   163.3 Wm-1K-1 at 273K  
  Thermal Expansion   4.15 x 10-6/°C  
  Hardness   Knoop 1150  
  Specific Heat Capacity   703 J/(kg K)  
  Dielectric Constant   13 at 10GHz  
  Young's Modulus (E)   131 GPa  
  Shear Modulus (G)   79.9 GPa  
  Bulk Modulus (K)   102 GPa  
  Elastic Coefficients   C11=167 MPa, C12=65 MPa,
C44=80 MPa
 
  Poisson Ratio   0.266  
CHEMICAL  
  Solubility   Insoluble in water  
  Molecular Weight   28.09  
  Class/Structure   Cubic diamond, Fd3m  

REFRACTIVE INDEX of Silicon Si

  Wavelength, µm

1.40

1.50 1.66 1.82 2.05 2.50

3.50-5.00

6.00-25.00  
  Refractive Index 3.49 3.48 3.47 3.46 3.45 3.44 3.43 3.42  


 
 
 
Blanks
Windows
Wedges
Plano-Convex Lenses
Bi-Convex Lenses
Bi-Concave Lenses
Meniscus
Right Angle Prisms


Si silicon dispersion prisms


Ordering Info

Crystaltechno Silicon optics

Crystaltechno Silicon boules

Crystaltechno Silicon boule cutting

Crystaltechno Silicon boule cut

Crystaltechno Silicon boule cut stock

 
  (c) Crystaltechno Ltd. Vernadskogo 113-106, Moscow 119571, Russia
+7 (495) 234-5951, 234-5952, 956-7610
fax +7 (495) 433-1551
sales@crystaltechno.com
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