Si Windows

Si Windows

 Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns. To avoid this, 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, and doping is usually boron (P-type) and phosphorus (N-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.

CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5-8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 um region; Mirror for CO2 laser and spectrometer applications.

 

Specifications:

Material: Si
Dimension Tolerance +0.0, -0.1mm
Thickness Tolerance: ± 0.1mm
Surface quality: 60/40
Clear Aperture: >85%
Flatness: λper 25mm
Parallelism: 3' 
Bevel: <0.25mm X 45°
Coating: Upon requirement

 

 Typical Sizes:

Round Shape
Diameter(mm):

Φ5.0;Φ10.0 ;Φ12.7;Φ15.0;Φ20.0;
Φ25.4;Φ30.0;Φ38.1;Φ50.8;Φ76.2

Square Shape:
WxH(mm)

5.0x5.0 ;10.0x10.0 ;15.0x15.0 ;
20.0x20.0;25.0x25.0;50.0x50.0

Thickness(mm):

0.5;1.0;1.5;2.0;3.0;
4.0;5.0;6.0;8.0;10.0

 

How to order Silicon (Si) Windows? 
Example:
Material:N-BK7 
Diameter:Φ25.4+0.0/-0.1mm 
Thickness:1.0±0.1mm 
Surface quality: 60-40 S/D 
Flatness: λ/2 per 25mm @633nm 
Paralelism: <1 arc minute
Coating:Both side AR,R<0.25% @1064nm, AOI=0°

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