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SI Crystal


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

Silicon (Si) is the most abundant electropositive element in the Earthundefineds crust. Itundefineds 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 μ m 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 μ m spectral range.

Basic Properties:

Material TypeCZ FZ; N or P
Crystal Direction{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 Point1410 °C
Boiling Point3265 °C
Knoop Hardness (kg/mm2)1150
Transparency Range1000nm-10000nm 30000nm-300000nm

Casix can provide different dimension prism, window, mirror, wedge and lens at present.

Plano Product Capabilities:

AttributeCommercialHigh Precision
Eed-Faces Configuration
Flat
Dimension Tolerance± 0.1mm± 0.1mm
Surface Quality40-20 scratch and dig10-5 scratch and dig
Flatnessλ/4λ/10
Parallelism20"2"
Perpendicularity
15'5'

Plano Product Detail Specifications:

TypePolishing AreaRoughness


Thick Plate

≤5x5mm1nm
5x5 - 8x8mm1nm
8x8 - Φ38mm1nm
Prism≤20x20mm1nm


Thin Plate

≤5x5mm1nm
5x5 - 8x8mm1nm
8x8 - ≤ Φ 38mm1nm

Lens Specification:

Diameter size
5-50mm
Shape
Plano-convex, Double-convex, Plano-concave & Double-concave
Surface FigurePower(N)≤3
Irregularity(ΔN)≤0.5
Centration
centration
Surface quality
40-20 scratch and dig, 5≤ Φ ≤22mm
60-40 scratch and dig, 22≤ Φ ≤50mm


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