Germanium is one of the most commonly used materials in the longwave infrared (lambda similar to 8-12 mu m), but ironically, its absorption coefficient is poorly known in this range. An infrared photothermal common-path interferometry system with a tunable quantum cascade pump laser is used to measure the absorption coefficient of >99.999% pure undoped germanium as a function of wavelengths between 9 and 11 mu m, varying between about 0.15 and 0.45 cm(-1) over this range. (C) 2020 Optical Society of America.
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机译：锗是长波红外（Lambda类似于8-12 mu m）中最常用的材料之一，但讽刺地，其吸收系数在该范围内知之甚少。 具有可调谐量子级联泵激光器的红外光热公共路径干涉系统用于测量> 99.999％纯未掺杂的锗的吸收系数，因为在9到11μm之间的波长，在约0.15和0.45cm之间变化（ - 1）在这个范围内。 （c）2020美国光学学会。
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