Thorlabs offers Thermal Imaging Lenses that are ideal for focusing long-wave infrared (LWIR) sources onto detectors or image sensors. The lenses, manufactured by LightPath Technologies, are mounted in threaded, black anodized aluminum housings engraved with the focal length and f/# (see the table below for details). Designed using Black Diamond-6 glass, their aspheric geometry allows them to focus light without introducing spherical aberration. The TIL4 and TIL8 lenses feature singlet designs, while the TIL15, TIL20, and TIL24 are doublets.
Black Diamond-6 (BD-6), a chalcogenide made of an amorphous mixture of arsenic (40%) and selenium (60%), has several advantages over germanium, which is traditionally used to fabricate IR optics. BD-6's thermally stable refractive index (see the Refractive Index tab) and low coefficient of thermal expansion (22.5 x 10-6 / °C) result in a smaller change in focal length as a function of temperature than for germanium. Additionally, germanium suffers from transmission loss as temperature increases, while BD-6 aspheric lenses can be used in environments up to 110 °C. This material performs particularly well over the 2 - 12 µm spectral range (click here for the transmission of an uncoated 1 mm thick sample).
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