Optical-Constants Spectra of Commercial Polyimide Film in the Wavelength Range 240–2500 nm

Abstract

Transmittance and reflectance spectra of a commercial 200-μm-thick polyimide film were recorded in the wavelength range λ = 240–2500 nm. The spectral dependences of the real (n) and imaginary (k) parts of the refractive index of the film were calculated from these spectra using the known exact analytical relations. Absorption spectra and the real and imaginary parts of the dielectric permittivity were also calculated in the indicated wavelength range.