Germanium Rectangular Windows

Germanium Windows（rectangular）

Germanium rectangular windows are an optical element made of germanium material, with a transmission spectrum range of 2-12 μ m. It is a commonly used infrared optical material with high hardness, good thermal conductivity, and water insolubility. Usually used as a protective window for electronic sensors or external environmental detectors. The shape is rectangular, with high transparency, anti reflection, and thermal stability. It is used in infrared imaging systems and infrared spectrometer systems. UM OPTICS can provide different types of window sheets such as circular, rectangular, wedge-shaped, perforated, and stepped sheets. Can be coated with reflective film, anti reflective film, filter film, spectroscopic film, polarizing film, and metallization film systems.

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If you need customization or bulk production, please contact us online and we will offer you a discounted price.

	Length(mm)	Width(mm)	ThK(mm)	Surface Accuracy	Parallelism	Surface Quality
	Screen Reset 29.5 25.4 25 13 12.7	Screen Reset 8.5 11.7 25.4 23.5 11 12.7	Screen Reset 1 3 0.3	Screen Reset 3(1)	Screen Reset 3′	Screen Reset 60-40
More+ Less	29.5	8.5	1	3(1)	3′	60-40
Sizes 29.5mm8.5mm1mm，Germanium Rectangular Windows Number：PGe02E004 Length(mm)：29.5 Width(mm)：8.5 ThK(mm)：1 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-12μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	29.5	11.7	1	3(1)	3′	60-40
Sizes 29.5mm11.7mm1mm，Germanium Rectangular Windows Number：PGe02E003 Length(mm)：29.5 Width(mm)：11.7 ThK(mm)：1 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-12μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	25.4	25.4	3	3(1)	3′	60-40
Sizes 25.4mm25.4mm3mm，Germanium Rectangular Windows Number：PGe02E002 Length(mm)：25.4 Width(mm)：25.4 ThK(mm)：3 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-12μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	25	23.5	1	3(1)	3′	60-40
Sizes 25mm23.5mm1mm，Germanium Rectangular Windows Number：PGe02E001 Length(mm)：25 Width(mm)：23.5 ThK(mm)：1 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-12μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	13	11	0.3	3(1)	3′	60-40
Sizes 13mm11mm0.3mm，Germanium Rectangular Windows Number：PGe02C002 Length(mm)：13 Width(mm)：11 ThK(mm)：0.3 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-15μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	12.7	12.7	3	3(1)	3′	60-40
Sizes 12.7mm12.7mm3mm，Ge Rectangular Windows Number：PGe02C001 Length(mm)：12.7 Width(mm)：12.7 ThK(mm)：3 Surface Accuracy：3(1) Parallelism：3′ Surface Quality：60-40 Clear Aperture：>90% Length Tolerance(mm)：+0.0/-0.1 Width Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） Transmission Range：2-12μm Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant

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 Windows（rectangular）

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