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<p>A&#xa0;methodology has been developed for determining the optical transparency of polyimide films used in the manufacture of flexible electronics by laser carbonization. Information about the optical transparency of polyimide films in the visible and near-infrared ranges of the spectrum allows for the selection of the optimal laser carbonization conditions. Data on the intensity of radiation, transmitted through polyimide films of various thicknesses at several thousand wavelengths in the visible and near-infrared spectral ranges, were obtained using a&#xa0;calibrated radiation source and compact high-resolution spectrometers. From the obtained dataset, two operating wavelengths of solid-state lasers were selected: 694.3 nm (ruby laser) and 1064 nm (neodymium-doped yttrium aluminum garnet laser, Nd:YAG). The transmittance of polyimide films with thicknesses of&#xa0;100, 200, and 300 μm as a&#xa0;function of these wavelengths was plotted. It was shown that similar dependencies can be constructed for all types of lasers emitting in the specified spectral ranges. Knowledge of the transmittance of polyimide at various wavelengths will help to more accurately investigate and understand the mechanisms of the physicochemical processes occurring in the material when exposed to laser radiation of a&#xa0;specific wavelength. The proposed methodology for determining the optical transparency of polyimide films can be used to find the transmission intensity of any translucent materials used in laser and other technologies.</p>

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Methodology for determining the optical transparency of polyimide films of various thicknesses using high-resolution spectrometers

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • B. A. Lapshinov,
  • E. V. Matveev,
  • A. I. Gaidar,
  • V. V. Berestov

摘要

A methodology has been developed for determining the optical transparency of polyimide films used in the manufacture of flexible electronics by laser carbonization. Information about the optical transparency of polyimide films in the visible and near-infrared ranges of the spectrum allows for the selection of the optimal laser carbonization conditions. Data on the intensity of radiation, transmitted through polyimide films of various thicknesses at several thousand wavelengths in the visible and near-infrared spectral ranges, were obtained using a calibrated radiation source and compact high-resolution spectrometers. From the obtained dataset, two operating wavelengths of solid-state lasers were selected: 694.3 nm (ruby laser) and 1064 nm (neodymium-doped yttrium aluminum garnet laser, Nd:YAG). The transmittance of polyimide films with thicknesses of 100, 200, and 300 μm as a function of these wavelengths was plotted. It was shown that similar dependencies can be constructed for all types of lasers emitting in the specified spectral ranges. Knowledge of the transmittance of polyimide at various wavelengths will help to more accurately investigate and understand the mechanisms of the physicochemical processes occurring in the material when exposed to laser radiation of a specific wavelength. The proposed methodology for determining the optical transparency of polyimide films can be used to find the transmission intensity of any translucent materials used in laser and other technologies.