Germanium Long Wave Pass Filter

Germanium long wave pass filter is a special optical device. The transparent band of the germanium substrate is between 2-12 μ m, and after exceeding 12 μ m, the transmittance begins to decrease and the absorption gradually increases. In the 5-12 μ m wavelength range, the absorption of germanium substrates is relatively small, making them advantageous for coating. Its working principle is based on optical interference and diffraction. When light passes through a filter, it interacts with the internal structure of the filter. Due to the different wavelength energy relationships of light, their interaction with the filter structure will also vary. Usually applied in fields such as biomedical, environmental monitoring, and geological exploration.

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	Diameter(inch)	Thickness(μm)	Orientation	Conductivity Type
	Screen Reset 8 6 4 2	Screen Reset 275-1000	Screen Reset <111> <100>	Screen Reset N/P
More+ Less	8	275-1000	<111>	N/P
Germanium Long Wave Pass Filters，Diameter 8"，Orientation <111> Number：PGeWA8002 Diameter(inch)：8 Thickness(μm)：275-1000 Orientation：<111> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	8	275-1000	<100>	N/P
Germanium Long Wave Pass Filters，Diameter 8"，Orientation <100> Number：PGeWA8001 Diameter(inch)：8 Thickness(μm)：275-1000 Orientation：<100> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	6	275-1000	<111>	N/P
Germanium Long Wave Pass Filters，Diameter 6"，Orientation <111> Number：PGeWA6002 Diameter(inch)：6 Thickness(μm)：275-1000 Orientation：<111> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	6	275-1000	<100>	N/P
Germanium Long Wave Pass Filters，Diameter 6"，Orientation <100> Number：PGeWA6001 Diameter(inch)：6 Thickness(μm)：275-1000 Orientation：<100> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	4	275-1000	<111>	N/P
Germanium Long Wave Pass Filters，Diameter 4"，Orientation <111> Number：PGeWA4002 Diameter(inch)：4 Thickness(μm)：275-1000 Orientation：<111> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	4	275-1000	<100>	N/P
Germanium Long Wave Pass Filters，Diameter 4"，Orientation <100> Number：PGeWA4001 Diameter(inch)：4 Thickness(μm)：275-1000 Orientation：<100> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	2	275-1000	<111>	N/P
Germanium Long Wave Pass Filters，Diameter 2"，Orientation <111> Number：PGeWA2002 Diameter(inch)：2 Thickness(μm)：275-1000 Orientation：<111> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30
More+ Less	2	275-1000	<100>	N/P
Germanium Long Wave Pass Filters，Diameter 2"，Orientation <100> Number：PGeWA2001 Diameter(inch)：2 Thickness(μm)：275-1000 Orientation：<100> Substrate Material：Germanium（Ge） Conductivity Type：N/P Diameter Tolerance(mm)：±0.2 Thk Tolerance(mm)：±10 Orientation Tolerance：±1° Resistance(Ω.cm)：10-1000 TTV(μm)：<10 BOW(μm)：<30 WARP(μm)：<30

Material Data
Optical Properties
Transmission Range	2-15μm
Reflection Loss	4.0028@10.6μm
Absorption Coefficienet	1.3×10-3@3.8μm 3×10-2@10.6μm
Structure	Cubic Crystal System
Cleavage Planes	<111>
Physical Properties
Density [g/cm³]	5.33
Melting Point [℃]	936
Thermal Conductivity [W/(m×K)]	58.61 @ 293K
Thermal Expansion [10^-6/K]	6.1 @ 298K
Knoop Hardness [kg/mm²]	780
Specific Heat Capacity [J/(kg×K)]	310
Dielectric Constant	16.6 @9.37 GHz
Young's Modulus (E) [GPa]	102.7
Shear Modulus(G) [GPa]	67
Bulk Modulus(K) [GPa]	77.2
Poisson Coefficient	0.28
Chemical Properties
Solubility / g/L	Inoluble
Molecular Weight / g/mol	72.61

Germanium Long Wave Pass Filter

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