Germanium (Ge) crystal is a high-purity, crystalline semiconductor material with excellent infrared (IR) transmission properties, widely used in IR optics, such as lenses and windows, for thermal imaging, spectroscopy, and night vision applications. Its high refractive index and low optical dispersion make it ideal for precise IR applications.

The preparation of germanium crystals is usually carried out by zone-melting, a technique for purifying semiconductor materials that results in highly pure germanium crystals.

With the development of science and technology, the demand for germanium crystals continues to grow, especially in the fields of high-performance computing and advanced communication technologies. At the same time, researchers are also exploring new synthesis methods and application areas to expand the application range of germanium crystals and reduce costs.