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Non-erasable fine-pitched grating structures were successfully encoded in SiO 2 glasses and amorphous SiO 2 thin films on silicon wafers by colliding a pair of focused pulses split from a single femtosecond (fs) pulse from a 10 Hz mode-locked Ti:sapphire laser with a regenerative amplifier (wavelength; 800 nm, pulse duration; 100 fs). This pattern was not observed for cases in which...
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