Speaker: Larissa Boie, Paul Scherrer Institute
Program Description:
Among recent advanced manufacturing techniques, non-ablative femtosecond laser processing has gained a lot of attention thanks to its applicability to a variety of substrates and its unique ability to locally process transparent materials in their volumes. [1-3]. Recently reported nano-crystallization [4,5] upon laser-matter interaction can pave the way for tailoring the properties of these modifications. Yet, the mechanism driven by locally extreme exposure conditions, similar to warmdense state of matter (WDM), remains elusive.
Here, I present operando X-ray microdiffraction experiments studying in situ nano-crystallization dynamics initiated by non-linear material interaction of an ultrafast IR laser with two prototypical metallic glasses. We identified crystalline phases formed in the pristine material originating from the modification with non-linear laser absorption. Moreover, we estimated the timescales of these processes with microsecond time resolution.
[1] D. Du, X. Liu, G. Korn, J. Squier, and G. Mourou, Laser-Induced Breakdown by Impact Ionization in SiO2 with Pulse Widths from 7 ns to 150 fs, Appl. Phys. Lett. 64, 23 (1994).
[2] K. M. Davis, K. Miura, N. Sugimoto, and K. Hirao, Writing Waveguides in Glass with a Femtosecond Laser, Opt. Lett. 21, 21 (1996).
[3] E. Williams and E. B. Brousseau, Nanosecond Laser Processing of Zr41.2Ti13.8Cu12.5Ni10Be22.5 with Single Pulses, J. Mater. Process. Tech. 232, 34 (2016).
[4] G. Torun, T. Kishi, Y. Bellouard, Direct-write laser-induced self-organization and metallization beyond the focal volume in tellurite glass, Phys. Rev. Materials 5, 55201 (2021)
[5] R. Ricca, Y. Bellouard, Single-Layer Subwavelength Femtosecond-Laser-Induced Confined Nanocrystallization in Multistack Dielectrics, Phys. Rev. Applied 19, 44035 (2023)
