Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Space-Selective Control of Functional Crystals by Femtosecond Laser: a Comparison Between SrO-TiO2-SiO2 and Li2O-Nb2O5-SiO2 Glasses

Version 1 : Received: 30 September 2020 / Approved: 1 October 2020 / Online: 1 October 2020 (18:40:17 CEST)

A peer-reviewed article of this Preprint also exists.

He, X.; Liu, Q.; Lancry, M.; Brisset, F.; Poumellec, B. Space-Selective Control of Functional Crystals by Femtosecond Laser: A Comparison between SrO-TiO2-SiO2 and Li2O-Nb2O5-SiO2 Glasses. Crystals 2020, 10, 979. He, X.; Liu, Q.; Lancry, M.; Brisset, F.; Poumellec, B. Space-Selective Control of Functional Crystals by Femtosecond Laser: A Comparison between SrO-TiO2-SiO2 and Li2O-Nb2O5-SiO2 Glasses. Crystals 2020, 10, 979.

Journal reference: Crystals 2020, 10, 979
DOI: 10.3390/cryst10110979

Abstract

We report on space-selective crystallization of congruent and polar Sr2TiSi2O8 crystals in a stoichiometric SrO-TiO2-SiO2 glass induced by (1030 nm, 300 fs) femtosecond laser irradiation. This allows us to compare with non-congruent laser induced crystallization of polar LiNbO3, in non stoichiometric Li2O-Nb2O5-SiO2 glass and gain information on the mechanism of nanocrystals orientation with the laser polarization that we pointed out previously. Using scanning electron microscopy (SEM), Second-harmonic generation (SHG) and electron backscattered diffraction (EBSD), we studied the laser induced crystallization according to the laser processing parameters (pulse energy, pulse repetition rate, scanning speed). We found 1) a domain where the laser track is filled with crystals not perfectly textured (low energy), 2) a domain where an amorphous volume remain surrounded by a crystallized shell (high energy). This arises from Sr out-diffusion and may gives rise to crystallization of both SrTiO3 and Sr2TiSi2O8 phases at low speed. In the one-phase domain (at higher speed), it is found the possibility to elaborate a tube with a perfect fresnoite texture. Significant difference in size and morphology whereas crystallization threshold remains similar are discussed based on glases thermal propeties. Contrarily to Li2O-Nb2O5-SiO2 (LNS) glass, no domain of oriented nanocrystallization controlled by the laser polarization has been found in SrO-TiO2-SiO2 (STS) glass, which is attributed to the larger crystallization speed in STS glass. No nanogratings have also been found that is likely due to the congruency of the glass.

Subject Areas

femtosecond laser-induced crystallization; nonlinear crystals; controllable texture; fresnoite; Sr2TiSi2O8; LiNbO3; glass

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