Abstract
We examine the spatiotemporal dynamics of filamentation and subsequent material changes in two transparent media, fused silica and poly(methyl methacrylate) (PMMA), using inline holographic microscopy. We are able to dynamically observe the nonlinear propagation of femtosecond laser pulses and the consequent evolution of the electronic excitatio n and trapping inside the bulk of both materials. In the case of fused silica we reveal the physical conditions for the formation of nanogratings, measuring excited electron densities well below the critical density while for PMMA we show that excited electrons with densities exceeding 1018 cm−3, exhibit complex trapping dynamics in a 200 fs time scale. The clear demonstration of ultrafast sub-ps photochemical processes that take place during the irradiation of PMMA with femtosecond pulses will have a strong impact on the laser microprocessing of polymers and nanosurgery applications of bio-related materials.
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Acknowledgments
We gratefully acknowledge the inspiration and impact in this work of the late Savas Georgiou, to whose memory we dedicate this article. We also wish to acknowledge helpful discussions with Nikita Bityurin. This work was supported by the European Union Marie Curie Excellence Grant “MULTIRAD” MEXT-CT-2006-042683 and in part by the EU FP7 Programs “LASERLAB-EUROPE” I and II.
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Papazoglou, D.G., Abdollahpour, D. & Tzortzakis, S. Ultrafast electron and material dynamics following femtosecond filamentation induced excitation of transparent solids. Appl. Phys. A 114, 161–168 (2014). https://doi.org/10.1007/s00339-013-8114-4
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DOI: https://doi.org/10.1007/s00339-013-8114-4