Zhanfeng Tu, Yu Teng, Jiajia Zhou, Shifeng Zhou, Heping Zeng and Jianrong Qiu Raman spectroscopic investigation on femtosecond laser induced residual stress and element distribution in bismuth germanate glasses Journal of Raman Spectroscopy 44
Localized microstructure and elemental redistribution were induced in bismuth germanate glasses by irradiation with high repetition rate 800 nm femtosecond laser pulses. The microscopic Raman spectra indicated that the residual thermal stress increases from the unmodified region to the center of the laser modified region, while Bi is enriched at the boundary area of the inner structure of the laser modified region relative to Ge. Electron microprobe analysis further confirmed the elemental redistribution of Bi and Ge, which agrees well with the Raman spectral analysis.
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