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Nano-Crystal and Microstructure Formation in Fluoride Photo-Thermo-Refractive Glass Using Chirp-Controlled Ultrafast Laser Bessel Beams

Abstract : Nano-crystals were formed in the exposed regions of photo-thermo-refractive glass undergoing irradiation with zeroth order chirp-controlled ultrafast laser Bessel beams and subsequent heat treatment. Effects of various writing powers, pulse durations and heat treatment time on the distribution and the size of the nano-crystals were investigated. The results show that nano-crystals’ distribution depended on the laser power density spatial shape, while the size of the nano-crystals is quasi-independent. However, the average diameter of the nano-crystals was affected by the heat treatment time, decreasing from 175 to 105 nm with the time halved. In addition, using crystallographic characterization by X-ray diffraction, the nano-crystal composition in the laser-exposed regions was detected to be sodium fluoride.
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https://hal-ujm.archives-ouvertes.fr/ujm-03242414
Contributor : Razvan Stoian <>
Submitted on : Monday, May 31, 2021 - 9:31:15 AM
Last modification on : Tuesday, June 1, 2021 - 3:22:01 AM

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Yunjie Zhang, Xu Wang, Guodong Zhang, Razvan Stoian, Guanghua Cheng. Nano-Crystal and Microstructure Formation in Fluoride Photo-Thermo-Refractive Glass Using Chirp-Controlled Ultrafast Laser Bessel Beams. Nanomaterials, MDPI, 2021, 11 (6), pp.1432. ⟨10.3390/nano11061432⟩. ⟨ujm-03242414⟩

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