Our Germanium lenses are perfect for Mid-Infrared applications. These lenses stand up well to harsh environments and we offer the most popular sizes with Anti-Reflection Coatings. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these lenses 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 is 780, making it ideal for IR applications requiring rugged optics.
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