Germanium Round Windows

Germanium Windows (round)

Germanium circular windows is a kind of optical element made of germanium material, transmission spectrum range of 2-12μm, is a common infrared optical material, with high hardness, good thermal conductivity, insoluble in water and so on. Used as a protective window for electronic sensors or external environment detectors. Round shape, high light transmittance, high anti-reflection, high thermal stability, etc., used in infrared imaging system and infrared spectrometer system. Micron optics can provide different types of window pieces such as round, rectangular, wedge, open hole and step pieces. It can be plated with reflective film, anti-reflection film, filter film, spectroscopic film, polarization film and metallization film system.

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	Dia(mm)	ThK(mm)	Surface Quality	PV@632.8nm	Parallelism	Bevel(mm)
	Screen Reset 76.2 75 50.8 50 40 38.1 30 25.4 25 24 20 19 18 16 12.7 12.5 12 10	Screen Reset 6 3 5 4 2 1 0.5 2.5 1.5	Screen Reset 40-20 60-40	Screen Reset 2λ λ λ/2	Screen Reset 3′	Screen Reset 0.35
More+ Less	76.2	6	40-20	2λ	3′	0.35
Φ76.2mm，Thickness 6mm，Germanium Round Windows Number：PGe01H004 Dia(mm)：76.2 ThK(mm)：6 Surface Quality：40-20 PV@632.8nm：2λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	76.2	3	40-20	2λ	3′	0.35
Φ76.2mm，Thickness 3mm，Germanium Round Windows Number：PGe01H003 Dia(mm)：76.2 ThK(mm)：3 Surface Quality：40-20 PV@632.8nm：2λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	76.2	5	60-40	2λ	3′	0.35
Φ76.2mm，Thickness 5mm，Germanium Round Windows Number：PGe01H002 Dia(mm)：76.2 ThK(mm)：5 Surface Quality：60-40 PV@632.8nm：2λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	75	5	60-40	λ	3′	0.35
Φ75mm，Thickness 5mm，Germanium Round Windows Number：PGe01H001 Dia(mm)：75 ThK(mm)：5 Surface Quality：60-40 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	5	40-20	λ	3′	0.35
Φ50.8mm，Thickness 5mm，Germanium Round Windows Number：PGe01F014 Dia(mm)：50.8 ThK(mm)：5 Surface Quality：40-20 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	4	40-20	λ	3′	0.35
Φ50.8mm，Thickness 4mm，Germanium Round Windows Number：PGe01F013 Dia(mm)：50.8 ThK(mm)：4 Surface Quality：40-20 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	3	40-20	λ	3′	0.35
Φ50.8mm，Thickness 3mm，Germanium Round Windows Number：PGe01F012 Dia(mm)：50.8 ThK(mm)：3 Surface Quality：40-20 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	2	40-20	λ	3′	0.35
Φ50.8mm，Thickness 2mm，Germanium Round Windows Number：PGe01F011 Dia(mm)：50.8 ThK(mm)：2 Surface Quality：40-20 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	1	40-20	λ/2	3′	0.35
Φ50.8mm，Thickness 1mm，Germanium Round Windows Number：PGe01F010 Dia(mm)：50.8 ThK(mm)：1 Surface Quality：40-20 PV@632.8nm：λ/2 Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） Bevel(mm)：0.35 Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	50.8	3	60-40	λ	3′	0.35
Φ50.8mm，Thickness 3mm，Germanium Round Windows Number：PGe01F009 Dia(mm)：50.8 ThK(mm)：3 Surface Quality：60-40 PV@632.8nm：λ Parallelism：3′ Clear Aperture：>90% Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Transmission Range：2-15μm Substrate Material：Germanium（Ge） 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 (round)

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Material Data

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