Germanium Optical Windows

Minimize chromatic aberration due to low dispersion
Anti-reflection coated for 3 µm to 12 µm or 8 µm to 12 µm
Available in 7 sizes from 10.0 mm to 75.0 mm diameter
Ideal for IR applicaitons

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Overview
Specifications
Ordering
Literature & Downloads

Germanium optical windows are ideal for IR applications with its broad transmission range and opacity in the visible portion of the spectrum. Germanium (Ge) has high index of refraction, making it a perfect choice for applications that require low dispersion. Germanium is also commonly used in imaging system operating in the 2 µm to 12 µm spectral range. The AR coating provides high transmission from 2 µm to 16 µm while reducing the high surface reflectivity of the substrate. It is an excellent choice for optics used in low power CO₂laser applications.

Specifications

	GEW	10GE & 10SI
Material	Optical Grade Germanium	Optical Grade Germanium or Silicon
Thickness	See Order Table
Clear Aperture	Central 90% of diameter	Central 85% of diameter
Size tolerance	+0.0/-0.1 mm	± 0.20 mm
Thickness Tolerance	± 0.1 mm	± 0.25 mm
Surface Quality	40-20 scratch-dig
Surface Flatness	λ/20 @ 10.6 µm
Parallelism	< 1 arc minute	< 3 arc minute
Coating	3-12 µm AR, < 5% per surface 8-12 µm AR, < 2% per surface	Uncoated
Refractive Index	1.765 @ 632.8 nm	Silicon: 3.42 @ 632.8 nm
Hardness (Knoop)	800 kg mm^-2	Silicon: 1100 kg mm^-2
Young's modulus	103 GPA	Silicon: 130.91 GPA
Thermal Limit	59 W m^-1 K^-1@ 293 K	Silicon: 163 W m^-1 K^-1@ 313 K
Thermal expansion coefficient	6.1 x 10^-6 K^-1 @ 298 K	Silicon: 2.6 x 10^-6 K^-1 @ 293 K

Window Information Table

Model	Diameter (mm)	Thickness (mm)
GEW10AR.20	10.0	1.5
GEW11AR.20	12.5	2.0
GEW12AR.20	20.0	2.0
GEW13AR.20	25.0	3.0
GEW14AR.20	30.0	3.0
GEW15AR.20	50.0	3.0
GEW16AR.20	75.0	5.0
GEW17AR.21	10.0	1.5
GEW18AR.21	12.5	2.0
GEW19AR.21	20.0	2.0
GEW20AR.21	25.0	3.0
GEW21AR.21	30.0	3.0
GEW22AR.21	40.0	4.0
GEW23AR.21	50.0	3.0
GEW24AR.21	75.0	5.0
10GE20	25.4	2.0
10SI20	25.4	2.0

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
10GE20	Germanium Window, 25.4 mm Diameter, 2.0 mm Thick, Uncoated	0	In Stock	205	$205.00	ADD
10SI20	Silicon Window, 25.4 mm Diameter, 2.0 mm Thick, Uncoated	0	In Stock	181	$181.00	ADD
GEW10AR.20	Germanium Window, 10.0 mm Diameter, 1.5 mm Thick, 3-12 µm	0	In Stock	189	$189.00	ADD
GEW11AR.20	Germanium Window, 12.50mm Diameter, 2.0 mm Thick, 3-12 µm	0	In Stock	220	$220.00	ADD
GEW12AR.20	Germanium Window, 20.0 mm Diameter, 2.0 mm Thick, 3-12 µm	0	In Stock	245	$245.00	ADD
GEW13AR.20	Germanium Window, 25.0 mm Diameter, 3.0 mm Thick, 3-12 µm	0	In Stock	271	$271.00	ADD
GEW14AR.20	Germanium Window, 30.0 mm Diameter, 3.0 mm Thick, 3-12 µm	0	In Stock	372	$372.00	ADD
GEW15AR.20	Germanium Window, 50.0 mm Diameter, 3.0 mm Thick, 3-12 µm	0	In Stock	624	$624.00	ADD
GEW16AR.20	Germanium Window, 75.0 mm Diameter, 5.0 mm Thick, 3-12 µm	3	3 Weeks	1128	$1,128.00	ADD
GEW17AR.21	Germanium Window, 10.0mm Diameter, 1.5 mm Thick, 8-12 µm	8	8 Weeks	185	$185.00	ADD
GEW18AR.21	Germanium Window, 12.50mm Diameter, 2.0 mm Thick, 8-12 µm	8	8 Weeks	220	$220.00	ADD
GEW19AR.21	Germanium Window, 20.0 mm Diameter, 2.0 mm Thick, 8-12 µm	8	8 Weeks	245	$245.00	ADD
GEW20AR.21	Germanium Window, 25.0 mm Diameter, 3.0 mm Thick, 8-12 µm	8	8 Weeks	269	$269.00	ADD
GEW21AR.21	Germanium Window, 30.0 mm Diameter, 3.0 mm Thick, 8-12 µm	8	8 Weeks	372	$372.00	ADD
GEW22AR.21	Germanium Window, 40.0 mm Diameter, 4.0 mm Thick, 8-12 µm	8	8 Weeks	498	$498.00	ADD
GEW23AR.21	Germanium Window, 50.0 mm Diameter, 3.0 mm Thick, 8-12 µm	8	8 Weeks	625	$625.00	ADD
GEW24AR.21	Germanium Window, 75.0 mm Diameter, 5.0 mm Thick, 8-12 µm	0	In Stock	1129	$1,129.00	ADD

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Germanium Optical Windows

Specifications

Window Information Table

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