Composition distribution change inside glasses by laser induced local heating and control of temperature distribution

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We developed the technique to control the elemental distribution changes inside glasses by irradiation with focused femtosecond laser pulses at a high repetition rate. Because the temperature distribution during laser irradiation is important for elemental distribution change, we developed the multi-spots' irradiation system to make multiple heat sources which produce variously shaped temperature distribution. In addition, the temperature distribution and the mechanism of thermal deformation which is accompanied with the elemental distribution change were elucidated by analyzing the shape of thermal deformation. Based on the elucidated temperature distribution and using the multi-spots' irradiation system, we succeeded to make variously shaped elemental distributions inside glasses. The controlling factors for element migration were also elucidated based on the simulation study.