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Optical constants of Kapton
Zhang et al. 1998: n,k 1.67-20.0 µm
(1.667 – 20.000)
Complex refractive index (n+ik)
Derived optical constants
Z. M. Zhang, G. Lefever-Button, and F. R. Powell. Infrared refractive index and extinction coefficient of polyimide films, Int. J. Thermophys. 19, 905-916 (1998)
[Calculation script (Python)]
Kapton is a polyimide film developed by DuPont in the late 1960s that remains stable across a wide range of temperatures.