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Germanium opitcs- Ge window

Short Description:

A germanium window is an optical window which is opaque to UV and visible light but has a broad transmission range in IR. It has minimal chromatic aberration due to low dispersion, and we recommend using an anti-reflection coating because of its high index of refraction (4.0 from 2 – 14μm). Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Germanium window should be used at temperatures below 100°C.


Production capability: 1000-3000pcs per month

Payment : Paypal, Western Union, T/T

Shipping method: Express, Airfreight, Ocean freight


We can provide

·Competitive Prices

·Quality ISO:9001-2015 Certified

·ROHS Compliant

·Short lead time

·Standard size stock available

·Fast Prototyping

·Custom Optics Fabrication

·Quality assurance

·Warranty & After sales service


Product Detail

Product Tags

Product Description

A germanium window is an optical window which is opaque to UV and visible light but has a broad transmission range in IR. It has minimal chromatic aberration due to low dispersion, and we recommend using an anti-reflection coating because of its high index of refraction (4.0 from 2 – 14μm). Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Germanium window should be used at temperatures below 100°C.

Germanium transmits over 45% between 2-14μm up to 45⁰C, but transmission degrades slowly at 100⁰C then more rapidly above 200⁰C. Exposure to higher temperatures can lead to catastrophic failure in the material so Germanium is not suited for use in these conditions. Where weight is an issue, its relatively high density (5.327gm/cc) should be considered .
The Knoop Hardness of Germanium (780) is approximately twice that of Magnesium Fluoride, making it ideal for IR applications requiring rugged optics. Germanium’s high density (5.33 g/cm^3) should be considered when designing for weight-sensitive systems

Germanium windows are ideal for IR applications at a broad range of wavelengths, including use in lower power CO2 lasers. Germanium also has low dispersion, ideal for imaging applications. The windows feature an AR coating providing high transmission from 3 to 12 µm.

We supply a wide range of anti-reflection coated germanium windows in a variety of shapes and sizes, both off the shelf and custom-made for your exact requirements.

Feature

1. Ideal for near-IR applications

2. Broadband 3 to 12 µm anti-reflection coating

3. Ideal for applications requiring low dispersion

4. Great for low power CO2 laser applications

Application

Typical applications for Germanium include thermal imaging where the material can be used as a front optic while its index of refraction makes Germanium useful for wide-angle lenses and microscopes. Additionally, Germanium components can be used for FLIR (Forward Looking Infrared) and FTIR (Fourier Transformed Infrared) spectroscopy systems, alongside other analytical instruments.Germanium Windows are commonly used in defence and aerospace industries, life and medical sciences, industrial OEM and many other infrared applications.

Product Parameter

Applicable to infrared imaging, monitoring, infrared inspection, telemetry and infrared spectroscopic optical system.

Technical Requirement

Commercial Grade

Precision Grade

High Precision

Size range

1-600mm

2-600mm

2-600mm

Diameter tolerance

土0.1mm

土0.025mm

土0.01mm

Thickness tolerance

土0.1mm

土0.025mm

土0.01mm

Parallelism

±3´

±1´

±30´´

Surface quality

60-40

40-20

20-10

Surface accuracy

1.0λ

λ/10

λ/20

Coating

3-5μm OR 8-12μm AR, <2% per Surface

Bevelling

0.1-0.5mm*45°

Substrate

Monocrystalline germanium

Diameter(mm)

Thickness(mm )

Coating

Diameter(mm)

Thickness(mm)

10

1

AR/AR OR

AR/DLC

3-5μm OR 8-12μm AR, <2% per Surface

-

75

3

12.5

1

75

5

20

2

76.2

6

25

3

80

8

30

3

90

10

38.1

3

100

10

40

4

150

15

50

3

180

18

50.8

3

200

20

63.5

5

300

35


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