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See all 66 Products in Family

TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

40mm Dia. x 2.0mm Thick 3-12μm AR Coated, Ge Window

Name: 40mm Dia. x 2.0mm Thick 3-12μm AR Coated, Ge Window
Brand: TECHSPEC
SKU: 23-151
Price: €1.060,00

Germanium (Ge) Windows

Stock #23-151 3-4 days

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€1.060^,00

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€1.060,00

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Product Downloads

STEP:step

Curve:pdf

PDF Drawing:pdf

IGES:igs

eDrawing:eprt

EO Spec Sheet

Specifications
Product Details
Technical Information
Accessories
Related Products
Imaging Lens Selector
Frequently Purchased Together
Resources

Specifications

General

Type:

Protective Window

Physical & Mechanical Properties

Bevel:

Protective as needed

Clear Aperture (%):

90.00

Clear Aperture CA (mm):

36.00

Diameter (mm):

40.00 +0.0/-0.1

Thickness (mm):

2.00 ±0.1

Edges:

Fine Ground

Knoop Hardness (kg/mm²):

780

Parallelism (arcmin):

Poisson's Ratio:

0.28

Young's Modulus (GPa):

102.7

Optical Properties

Coating:

BBAR (3000-12000nm)

Coating Specification:

R_avg <5.0% @ 3 - 12µm

Index of Refraction (n_d):

4.002 @ 11µm

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

Germanium (Ge)

Surface Flatness (P-V):

λ/10 @ 10.6μm

Surface Quality:

60-40

Wavelength Range (nm):

3000 - 12000

Material Properties

Coefficient of Thermal Expansion CTE (10^-6/°C):

6.1

Density (g/cm³):

5.33

Regulatory Compliance

RoHS 2015:

Compliant

Certificate of Conformance:

View

REACH 241:

Compliant

Product Details

Uncoated or with AR Coatings Designed for a Variety of IR Ranges
Minimal Chromatic Aberration Due to Low Dispersion
Ideal for Infrared Applications Requiring Rugged Optics
DLC Coated Germanium Windows are also Available
Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.
Edmund Optics has limited remaining inventory of this part number and no raw material available to supply more once this is depleted. Please contact our Product Support Engineers to help with an alternate solution for your needs. Customer Service can provide you the latest price and availability.

TECHSPEC® Germanium (Ge) Windows are available off-the-shelf with three anti-reflection coating options: 3 - 5μm for mid-infrared applications, 3 - 12μm for broadband multispectral applications, or 8 - 12μm for thermal imaging applications. Due to its high index of refraction (around 4.0 from 2 - 14μm), an anti-reflection coating is recommended on these germanium windows for sufficient transmission in the region of interest. Germanium is subject to thermal runaway, meaning the transmission decreases as temperature increases. As such, TECHSPEC Germanium (Ge) Windows should be used at temperatures below 100°C. Germanium’s high density (5.33 g/cm3) should be considered when designing for weight-sensitive systems. The Knoop Hardness of germanium (780) is approximately twice that of magnesium fluoride, making it ideal for infrared applications requiring rugged optics.

Technical Information

AR COATED GERMANIUM
	Typical transmission of a 3mm thick Ge window with BBAR (3000-5000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3% @ 3000 - 5000nm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (3000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <5.0% @ 3 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data
	Typical transmission of a 3mm thick Ge window with BBAR (8000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: R_avg <3.0% @ 8 - 12μm Data outside this range is not guaranteed and is for reference only. Click Here to Download Data

Accessories

Imaging Lens Selector

Frequently Purchased Together

#57-872 - 108.0mm/4.25" Optic Dia., Optical Cell Kinematic Mount

€975,00

#20-241 - 200 x 200mm 38% Transmission Linear Polarizing Film (XP38)

€58,00

#26-921 - Super High Contrast Linear Polarizing Film, 200mm x 200mm

€125,00

#71-810 - 3" Dia, 12" FL Protected Silver, Spherical Mirror

€299,00

Resources

Filter

Anti-Reflection (AR) Coatings

Anti-reflection (AR) coatings are applied to optical components to increase throughput and reduce hazards caused by back-reflections.

View Now

An Introduction to Optical Coatings

Optical coatings are used to influence the transmission, reflection, or polarization properties of an optical component.

View Now

Advantages of using engineered chalcogenide glass for color corrected, passively athermalized LWIR imaging systems

View Now

Infrared Light

Optical Engineer Andrew Fisher explains how you can see the "invisible" light, or infrared light, from your own TV remote.

View Now

Short Wave Infrared (SWIR)

View Now

Beam Displacement Calculator

View Now

Understanding Optical Windows

Determine how to select an optical window based on its material transmission, thermal and mechanical properties, and other specifications at Edmund Optics.

View Now

Optical Windows Review

Optical Windows provide protection between an optical system or sensitive electronics and an outside environment.

View Now

I need a window for imaging underwater. The water is filtered and at room temperature with a very small amount of detergent in it. It is flowing at low speed. Will a MgF2 coated window survive this for a few years?

View Now

Advantages of Using Meniscus Lenses in Infrared Applications

Meniscus lenses offer superior performance compared to plano convex lenses in IR applications. Find out the benefits of using a meniscus lens at Edmund Optics.

View Now

The Correct Material for Infrared (IR) Applications

Using an Infrared Application? Discover the importance of choosing the right material and comparisons of each at Edmund Optics.

View Now

Is it okay to clean an infrared lens, for example one made of germanium, with ethanol?

View Now

Infrared (IR) Spectrum

View Now

UV vs. IR Grade Fused Silica

UV grade fused silica is ideal for UV and visible applications, but IR grade fused silica has better transmission in the IR due to a lack of OH- impurities.

View Now

What is SWIR?

Have a question about short-wave infrared (SWIR)? Find definitions, application uses, and examples at Edmund Optics.

View Now

Hyperspectral and Multispectral Imaging

Are you trying to gauge depth of field in your imaging system? Take a closer look at this article on depth of field calculations at Edmund Optics.

View Now

Hyperspectral & Multispectral Imaging – TRENDING IN OPTICS: EPISODE 7

Hyperspectral and multispectral imaging are imaging technologies that capture information from a broader portion of the electromagnetic spectrum.

View Now

You offer many substrates for UV and IR applications. How do I know which is best for me?

View Now

Optical Glass

Choosing the right optical glass is important. Find out factors and properties on how to select the right optical glass at Edmund Optics.

View Now

Surface Accuracy

View Now

BBAR Coating

View Now

Understanding Surface Quality Specifications

The surface quality of optical components the scattering off of its surface, which is especially important in laser optics applications.

View Now

Removing Protective Plastic Coating

A protective plastic coating protects a variety of our flat optics, such as optical windows, optical mirrors, and beamsplitters, from scratches during shipping.

View Now

Anti-Reflection (AR) Coating

View Now

Bevel

View Now

Parallelism

View Now

Seamed Edge

View Now

Introduction to Basic Ray Optics

An understanding of refraction and basic ray optics is a critical foundation for understanding more complicated optical concepts and technologies.

View Now

Surface Flatness

View Now

Transmission

View Now

How do I clean my optics?

View Now

Clear Aperture (CA)

View Now

Edmund Optics Global Manufacturing Facilities

Edmund Optics® (EO) manufactures millions of precision optical components and subassemblies every year in our 5 global manufacturing facilities.

View Now

Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Learn about the metrology that Edmund Optics® uses to guarantee the quality of all optical components and assemblies.

View Now

Surface Quality

View Now

40mm Dia. x 2.0mm Thick 3-12μm AR Coated, Ge Window

Can't find what you need?

Specifications

General

Physical & Mechanical Properties

Optical Properties

Material Properties

Regulatory Compliance

Product Details

Technical Information

Accessories

Related Products

Imaging Lens Selector

Frequently Purchased Together

Resources

Anti-Reflection (AR) Coatings

An Introduction to Optical Coatings

Advantages of using engineered chalcogenide glass for color corrected, passively athermalized LWIR imaging systems

Infrared Light

Short Wave Infrared (SWIR)

Beam Displacement Calculator

Understanding Optical Windows

Optical Windows Review

I need a window for imaging underwater. The water is filtered and at room temperature with a very small amount of detergent in it. It is flowing at low speed. Will a MgF2 coated window survive this for a few years?

Advantages of Using Meniscus Lenses in Infrared Applications

The Correct Material for Infrared (IR) Applications

Is it okay to clean an infrared lens, for example one made of germanium, with ethanol?

Infrared (IR) Spectrum

UV vs. IR Grade Fused Silica

What is SWIR?

Hyperspectral and Multispectral Imaging

Hyperspectral & Multispectral Imaging – TRENDING IN OPTICS: EPISODE 7

You offer many substrates for UV and IR applications. How do I know which is best for me?

Optical Glass

Surface Accuracy

BBAR Coating

Understanding Surface Quality Specifications

Removing Protective Plastic Coating

Anti-Reflection (AR) Coating

Bevel

Parallelism

Seamed Edge

Introduction to Basic Ray Optics

Surface Flatness

Transmission

How do I clean my optics?

Clear Aperture (CA)

Edmund Optics Global Manufacturing Facilities

Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

Surface Quality