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Silicon(Si) window

Silicon(Si) optical window
Material	Single crystal of Silicon(Si)
Other Names	Silicon window substrate, Si window, Silicon IR window
Crystal structure	Face-centred Cubic
Applicable wave band	1.2μm ~ 8μm
Melting Point	1420℃
Growth method	Czochralski(CZ) or Floating Zone(FZ)
Crystal properties	Orientation: <111> Conductivity type: N-type Resistivity: >15 ohm-cm or others
Refractive index	3.4223 @5 μm
Absorption coefficient	≤0.01 /cm at 3μm
Knoop Hardness	1550
Thermal conductivity	273.3 W/mK
Coefficient of thermal expansion	2.6×10^-6/℃ at 20℃
Maximum size	Diameter 260mm (Single crystal)

Material	Standard Size	Surface quality
Germanium(Ge) window	φ10.0mm x 1.0mm φ20mm x 2.0mm φ25.4mm x 3.0mm φ25.4mm x 5.0mm φ50mm x 1.0mm φ50.8mm x 3.0mm 12.7 x 12.7 x 3.0mm 25.4 x 25.4 x 3.0mm Or others	Polishing: Double side optical polished or Epi-polished Roughness: Ra<1.5nm or Ra 5~10nm, Ra<0.5nm, Size Tolerance: +/-0.1mm Thickness Tolerance: +/-0.1mm or +/-0.05mm Parallelism: 1 minute, 30 seconds, 5 seconds or higher Surface Finish: 60-40, 40-20, 20-10 (scratch-dig) Surface Figure: 1/2λ, 1/4λ or higher Chamfer: 0.25mm × 45° Coating: Upon requirements

Silicon windows and Germanium windows are the most commonly used Infrared(IR) windows. The best working wavelength of single crystal Silicon windows is 3-5um, and the best working wavelength of single crystal Germanium windows is 2-14um. It is one of the best substrate materials for filters.

Silicon(Si) window has good light transmission performance in the 1.2-7um wave band. Single crystal Silicon has good thermal conductivity and stability, low thermal expansion coefficient, relatively low density (half of Germanium window or Zinc Selenide window), with low cost. It is currently the first choice of material for CO2 laser mirrors. Commonly used in the production of laser mirrors and more sensitive to volume and weight.

Silicon window can be divided into Transmissive Grade and Mirror Grade. The Transmission-grade Silicon (OCZ-Si) is growth by Czochralski and widely used in the mid-Infrared (1-6um) band. The Silicon window growth by Floating zone(FZ-Si) can be used in a wider band (1--14um), the high purity Silicon window (HPFZ-Si) can even be used in the far Infrared band (30-300 μm).

We can customize different size and thickness of Silicon(Si) optical window upon requirements, such as Silicon(Si) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.

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BIOTAIN CRYSTAL CO., LIMITED
Tel: (+86) 1506 0796 451
Fax: (+86) 0597 2212602
Email: sales@crystal-material.com
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Silicon(Si) window

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