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Frequency mixing in boron carbide laser ablation plasmas

AutorOujja, M.; Benítez-Cañete, A.; Sanz, M. ; Lopez-Quintas, Ignacio ; Martín Muñoz, Margarita ; Nalda, R. de; Castillejo, Marta
Fecha de publicación2015
EditorElsevier
CitaciónApplied Surface Science 336: 53- 58 (2015)
ResumenNonlinear frequency mixing induced by a bichromatic field (1064 nm + 532 nm obtained from a Q-switched Nd:YAG laser) in a boron carbide (B4C) plasma generated through laser ablation under vacuum is explored. A UV beam at the frequency of the fourth harmonic of the fundamental frequency (266 nm) was generated. The dependence of the efficiency of the process as function of the intensities of the driving lasers differs from the expected behavior for four-wave mixing, and point toward a six-wave mixing process. The frequency mixing process was strongly favored for parallel polarizations of the two driving beams. Through spatiotemporal mapping, the conditions for maximum efficiency were found for a significant delay from the ablation event (200 ns), when the medium is expected to be a low-ionized plasma. No late components of the harmonic signal were detected, indicating a largely atomized medium.
URIhttp://hdl.handle.net/10261/141992
DOI10.1016/j.apsusc.2014.09.119
Identificadoresdoi: 10.1016/j.apsusc.2014.09.119
issn: 0169-4332
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