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Imaging the ultrafast Kerr effect, free carrier generation, relaxation and ablation dynamics of Lithium Niobate irradiated with femtosecond laser pulses

AuthorsGarcía-Lechuga, Mario ; Siegel, Jan ; Hernández Rueda, Javier ; Solís Céspedes, Javier
Issue Date2014
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 116: 113502 (2014)
Abstract© 2014 AIP Publishing LLC. The interaction of high-power single 130 femtosecond (fs) laser pulses with the surface of Lithium Niobate is experimentally investigated in this work. The use of fs-resolution time-resolved microscopy allows us to separately observe the instantaneous optical Kerr effect induced by the pulse and the generation of a free electron plasma. The maximum electron density is reached 550fs after the peak of the Kerr effect, confirming the presence of a delayed carrier generation mechanism. We have also observed the appearance of transient Newton rings during the ablation process, related to optical interference of the probe beam reflected at the front and back surface of the ablating layer. Finally, we have analyzed the dynamics of the photorefractive effect on a much longer time scale by measuring the evolution of the transmittance of the irradiated area for different fluences below the ablation threshold.
Identifiersdoi: 10.1063/1.4895833
issn: 1089-7550
Appears in Collections:(CFMAC-IO) Artículos
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