Oscillation of the refractive index at the focal region of a femtosecond laser pulse inside a glass |
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Authors: | Sakakura Masaaki Terazima Masahide |
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Institution: | Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. |
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Abstract: | The temporal evolution of refractive-index change produced by a tightly focused femtosecond (fs) laser pulse inside a soda-lime glass plate was investigated by use of a transient lens method with subpicosecond time resolution. An oscillating behavior of the light intensity in the central region of the probe beam was observed 0-1500 ps after irradiation of the plate. The oscillation was interpreted in terms of a rapid temperature increase and the ensuing propagation of the pressure wave. This study is to our knowledge the first real-time observation of refractive-index change inside a glass induced by a fs laser pulse. |
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