Abstract
In this paper, we report a non-reciprocal writing process for inducing asymmetric microstructure using a femtosecond laser with tilted pulse fronts in fused silica. The shape of the induced microstructure at the focus closely depends on the laser scan direction. An elongated end is observed as a kind of structural difference between the written lines with two reverse scans along +x and –x, which further leads to a birefringence intensity difference. We also find a bifurcation in the head region of the induced microstructure between the written lines along x and y. That process results from the focal intensity distortion caused by the pulse front tilt by comparing the simulated intensity distribution with the experimental results. The current results demonstrate that the pulse front tilt not only affects the free electron excitation at the focus but also further distorts the shape of the induced microstructure during a high-energy femtosecond laser irradiation. These results offer a route to fabricate optical elements by changing the spatiotemporal characteristics of ultrashort pulses.
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This work was financially supported by National Natural Science Foundation of China (11604202) and Shanghai Natural Science Foundation (14ZR1415400).
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Song, H., Dai, Y., Song, J. et al. Femtosecond laser-induced structural difference in fused silica with a non-reciprocal writing process. Appl. Phys. A 123, 255 (2017). https://doi.org/10.1007/s00339-017-0882-9
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DOI: https://doi.org/10.1007/s00339-017-0882-9