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Opt Lett. 2009 Nov 1;34(21):3433-5. doi: 10.1364/OL.34.003433.

Femtosecond laser writing of Er3+-doped CaF2 crystalline patterns in glass.

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  • 1State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.


We report on the use of 800 nm, 250 kHz femtosecond laser pulses to precipitate Er(3+)-doped CaF(2) crystals inside oxyfluoride glass, which was confirmed with x-ray diffraction analysis. Confocal upconversion luminescence spectra show that the precipitated crystals have greatly enhanced upconversion luminescence intensity in comparison with unmodified glass. We demonstrate the possibility of three-dimensional optical data storage in the glass by the use of the confocal upconversion luminescence imaging.

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