Silicon (SI)
 
 

Silicon (Si) is commonly used as a substrate material for infrared reflectors and windows in the 1.5 micron-8 micron region. The strong absorption band at 9 micron 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. Silicon is also a useful transmitter in 20 micron range.

Silicon (Si) is the most abundant electropositive element in the Earth's crust. It's a metalloid with a marked metallic luster and very brittle. It is usually tetravalent in its compounds, although sometimes they are bivalent and purely electropositive in its chemical behavior. Moreover, pentacoordinated and hexacoordinated silicon compounds are also known.

Silicon lenses are popular for many applications in the IR. They are typically used for imaging applications in the 3-5 micron region of the spectrum, making them excellent for security and military applications. They can also be used to collimate infrared lasers. These lenses are coated with a BBAR coating that provides 98% transmission in the 3-5 micron spectral range.

 

 

 

Basic Properties

   

Material Type

CZ FZ; N or P

Crystal Dirction

{100} {111}

Resistivity (Ohm/cm)

0.003-50

thermal conductivity (J/k .m .s)

163.3 @ 273K

Density (g /cm-3)

2.33 g.cm-3 at 20 C

Melting point

1410 C

Boiling point

3265 C

Knoop Hardness (kg/mm2)

1150

Transparency Range

1000nm-10000nm 30000nm-300000nm

 

 

 

Plano Product Capabilities

 

ATTRIBUTE

COMMERCIAL

HIGH PRECISION

End-faces Configuration

Flat

Dimension Tolerance

0.1mm

0.01mm

Surface Quality

40-20 scratch and dig

10-5 scratch and dig

Flatness

/4

/10

Parallelism

20"

2"

Perpedicularity

15'

5'

 

 

 

Plano Product Specifications

 

Type

Polishing Area

Roughness

Thick plate

5x5mm

0.5nm

5x5 - 8x8mm

0.5nm

8x8 - 38mm

0.5nm

Prism

20x20mm

0.5nm

Thin plate

5x5mm

0.5nm

5x5 - 8x8mm

0.5nm

8x8 - 38mm

0.5nm

 

 

 

Lens Specifications

 

Diameter size

5-50mm

Shape

Plano-convex, Double-convex, Plano-concave & Double-concave

Surface Figure Power(N)

3

 Irregularity(N)

0.5

Centration

Z>0.15:C<=3

Z=0.1-0.15:C<=30

Z<0.1:No centration

Surface quality

40-20 scratch and dig, 5 22mm
60-40 scratch and dig, 22 50mm

mal style="TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left>Surface quality

40-20 scratch and dig, 5 22mm
60-40 scratch and dig, 22 50mm

 

 

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