Change in optical path length of saturable absorbing dye-doped polymer films under laser irradiation |
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Authors: | Kazuo Nakagawa Katunori Kawano |
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Institution: | 1. Department of Materials Science and Engineering, Muroran Institute of Technology, 27-1, Mizumoto, 050, Muroran, Japan
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Abstract: | The cause of the change in the optical path lengthΔ(nd) of the saturable absorbing dye-doped polymer films under laser irradiation is investigated using polyvinyl alcohol and gelatin films doped with erythrosin B. The temperature rise of the dye-doped films, the changes in optical path length, film thickness, the refractive index and the optical density of the dye-doped films are measured under laser irradiation. The thermal expansion due to the temperature rise of the dye-doped films caused by the irradiation has greater effect on theΔ(nd) than the fading of dye molecules due to the irradiation of laser beams. |
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