Germanium Windows

Name: Germanium Windows
Brand: Shenzhen Solar Valley Scitech Development Co., Ltd.

The infrared germanium window is processed through fine grinding, grinding, measuring, ultra-high-precision polishing and other processes. Under precise control of the machine tool and processing environment, ultra-high-precision correction polishing technology for these germanium windows is used to polish the window surface to achieve an optical plane. Infrared germanium window with surface shape accuracy ≤0.1 micron and surface roughness Ra≤0.01 micron.

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Specifications of Germanium Windows

Infrared germanium window product parameter table
project	Indicator requirements
1. Material	Single crystal germanium infrared material.
2. Diameter	OD≤300mm OD±0.025 or according to customer requirements
3. Center thickness	T±0.01 or according to customer requirements
4. Effective focal length	according to customers needs
5. Working distance	according to customers needs
6. Effective aperture	ED＞80% aspheric area
7. Coating	AR or DLC coating R＜0.5% @λnm
8. Surface shape	Ultra-high precision Rt≤0.1μm, high precision Rt≤0.5μm, precision Rt≤1μm
9. Surface quality	60-40, 40-20, 20-10, 10-5

Germanium Windows for Rugged Applications

Germanium windows are optical windows that are opaque to UV and visible light but offer broad transmission in the infrared (IR) spectrum. With minimal chromatic aberration due to low dispersion, these germanium optical windows are highly effective in IR applications, especially when paired with an anti-reflection coating to counter their high refractive index (4.0 from 2 – 14μm). Germanium (Ge) is a heavy and hard material, boasting a Knoop Hardness of 780, nearly twice that of magnesium fluoride (MgF), and a density of 5.33 g/cm³, making it ideal for robust optical applications. However, its transmission properties decrease sharply with rising temperatures—a phenomenon known as thermal runaway—limiting its use in environments where temperatures exceed 100°C. Despite this, germanium windows are well-suited for IR laser applications and can function as long pass filters, transmitting wavelengths greater than 2 µm. Additionally, germanium is nonreactive to air, water, alkalis, and many acids, and is highly scratch-resistant, further enhancing its suitability for rugged and demanding environments. Germanium glass windows, germanium IR windows, and germanium window transmission properties make these components indispensable in various high-performance optical systems.

Features of Germanium Windows

One-stop customized production: Solar Valley processes various custom optical windows, circular, D-shaped, square, trapezoidal and other structural infrared germanium windows according to customer requirements.
Material: Single crystal germanium infrared material, in the range of 2-12 μm, germanium is the most commonly used material for producing lenses and efficient infrared windows in imaging systems, and can serve as the substrate for lenses, windows and output coupling mirrors.
Lens properties: uniform light spot, clear projection, complete specifications, aerospace quality, used in night vision goggles, medical endoscopes, laser processing, infrared thermal imaging cameras, temperature recorders, infrared fundus cameras, satellite infrared telescopes, etc.
Product indicator description:
1. Maximum dimensions of circular infrared germanium window: OD≤φ300mm
2. Maximum dimensions of square infrared germanium window: L×W ≤300×300mm
3. Infrared germanium windows can reach the following accuracy levels according to customer requirements:
Ultra-high precision grade: surface error <0.1μm, surface roughness <0.01μm
High precision grade: Surface error <0.5μm, surface roughness <0.05μm Precision grade: Surface error <1μm, surface roughness <0.1μm
Surface defect grade: 60-40, 40-20, 20-10. Produced according to customer requirements.
Coating: Coating according to customer requirements.