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TECHSPEC® Germanium (Ge) Plano-Convex (PCX) Lenses feature precision diamond turned substrates that are available uncoated or with a variety of broadband anti-reflection (AR) coatings from 3 – 12µm. Germanium is chemically inert and insoluble in water with a Knoop Hardness of 780, making it ideal for defense, security, and thermal imaging applications requiring rugged optics. However, germanium is subject to thermal runaway and should be used at temperatures below 100°C to ensure optimal transmission. TECHSPEC® Germanium (Ge) Plano-Convex (PCX) Lenses are available in 12.5, 25 and 50mm diameters. Germanium’s high index of refraction (4.003) yields significant Fresnel reflection loss without anti-reflection coatings. TECHSPEC® Germanium (Ge) Plano-Convex lenses are available uncoated or with multiple Broadband Anti-Reflection (BBAR) coatings for enhanced transmission in the Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR).
For more information on Germanium properties, please review our guide to selecting The Correct Material for Infrared (IR) Applications.
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Typical transmission of a 3mm thick Ge window with BBAR (3000-5000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg <3% @ 3000 - 5000nm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick Ge window with BBAR (3000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg <5.0% @ 3 - 12μm Data outside this range is not guaranteed and is for reference only. |
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Typical transmission of a 3mm thick Ge window with BBAR (8000-12000nm) coating at 0° AOI. The blue shaded region indicates the coating design wavelengh range, with the following specification: Ravg <3.0% @ 8 - 12μm Data outside this range is not guaranteed and is for reference only. |
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