Germanium Windows are highly regarded for their exceptional transmission capabilities across the 2-14 µm waveband, making them suitable for both mid-wave infrared (MWIR) and long-wave infrared (LWIR) systems. As a widely used material in infrared (IR) optics, Germanium is a preferred choice for applications such as thermal imaging systems, where its high refractive index and low dispersion ensure precise and reliable optical performance.

One of the defining characteristics of Germanium is its thermal sensitivity. As the temperature of the Germanium window increases, its transmission efficiency decreases due to a thermal escape mechanism. This property necessitates careful thermal management in high-temperature environments, ensuring that the optical system maintains its effectiveness even under varying thermal conditions. Despite this, the high density of Germanium makes it an excellent material for applications requiring durability and mechanical strength.

Germanium Windows are extensively utilized in a variety of sectors, including defense and aerospace industries, where they are integral to the performance of thermal imaging and night vision systems. They also play a crucial role in life and medical sciences, industrial original equipment manufacturing (OEM), and numerous other infrared applications that demand high precision and reliability.

MOK Optics offers a comprehensive selection of Germanium Windows, available in three primary configurations: uncoated, AR (anti-reflective) coated on both sides, and AR/DLC (diamond-like carbon) coated. These coatings enhance the windows’ transmission efficiency and durability, with AR coatings reducing surface reflections and DLC coatings providing additional protection against environmental factors, scratches, and other forms of mechanical wear.

In addition to standard offerings, MOK Optics provides a custom range of Germanium Windows, allowing customers to specify squares, rectangles, and various other shapes to meet the specific needs of their application. The transmission wavelength for monocrystalline Germanium typically spans from 2 µm to 12 µm, with low absorbance at 10.6 µm, making it an ideal material for CO2 laser optics, including lenses and windows. This versatility and adaptability make Germanium a critical material in the design and manufacturing of high-performance infrared optical systems across multiple industries.