We have designed an oven for optical reflection measurements at temperatures as high as 1000 K. The compact setup can be attached to any Fourier-transform infrared spectrometer using a microscope. The details of the layout, operation, and performance are discussed as well as ways for reference measurements and data correction. Finally, the high-temperature setup is utilized to determine the infrared reflectivity of tungsten up to T = 1000 K, which can serve as a reference mirror for future experiments.

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The noise-like features in the mid-infrared spectral range are gas absorption lines because the setup is operated under atmospheric conditions. Most prominent are vibrational modes of CO2 and water (ν1 and ν2) when reflection of samples inside and outside the chamber is compared. In Fig. 7, these features are removed by smoothing the data.

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