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Crystals |
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Tel:+86-(0)591-87846955 +86-(0)591-87846952 Fax: +86-(0)591-87856157 Address:NO. 67, YangQi Road, JinShan FuWan Industrial Park, Fuzhou, FuJian, 350026, China E-mail: sales@phosctech.com Website: www.phosctech.com |
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Germanium Crystal |
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Germanium (Ge) is used widely for lenses and windows in thermal imaging and FLIR applications. Its high index of refraction makes it of particular interest. Useful transmission range of Germanium windows is from 2 to 12 μm. Germanium is opaque in the visible.
Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Ge window should be used at temperatures below 100°. The higher Knoop Hardness of Germanium (780) makes it ideal for IR applications requiring rugged optics. Germanium's high density (5.33g/cm3) should be considered when designing for weight-sensitive systems.
Material Properties:
Material Type
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N or P
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Resistivity (Ohm/cm)
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5-40
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Thermal conductivity (J/k .m .s)
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58.61 @ 293K
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Thermal Expansion Coefficients (1/°C)
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6.1x10-6@298K
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Density (g /cm-3)
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5.33
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Knoop Hardness (kg/mm2)
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780
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Absorption Coefficient
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3x10-2@10600nm
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PHOSCTECH can provide different dimension spherical Ge lens, Aspherical Ge lens ,Ge window,Ge mirror,Ge Rod and Ge wedge.
Capability:
Attribute
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Commercial
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High Precision
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Typical Diameter φ(mm)
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3, 6, 12.7, 25.4, 30, 38, 50.8, 60, 80, 160
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Typical Thickness (mm)
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0.6, 1, 2, 3, 5, 8, 10, 15, 20
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Dimension Tolerance
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± 0.1mm
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± 0.02mm
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Surface Quality
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60-40 scratch and dig
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10-5 scratch and dig
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Flatness
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λ/4
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λ/10
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Parallelism
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20"
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2"
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Perpendicularity
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15'
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5'
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Centration (arc min)
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<3'
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<1'
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Note: AR Coating and DLC coating are available upon request.
Other sizes are available upon request.
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