Co/Cu イオン添加ケイ酸塩ガラスのフェムト秒レーザー光照射による屈折率減少

概要

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Femto-second laser pulses (800 nm, 11 nJ/pulse, 82 MHz) were irradiated on the surface of Co- or Cu-doped silicate glasses (70SiO_2・20NaO_2・10Al_2O_3 doped with 20 mol% of CoO or CuO, respectively) for 1 s to modify its surface, which was observed by a scanning probe microscope and an ellipsometer. Some samples exhibited refractive index reduction without any structural modification, which was brought about by local increase in fictive temperature through spot heating and quenching. With the aid of a computer simulation using a finite element method, such a modification is found to occur when the maximum surface temperature is less than 1000℃ for the Cu-doped glass.
社団法人日本セラミックス協会の論文
2005-04-01