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Non-linear laser microscopies for non-destructive analysis of paintings

AuthorsSanz, Mikel ; Oujja, M. ; Dal Fovo, A.; Martínez-Hernández, A.; Fontana, R.; Castillejo, Marta
Issue Date26-Mar-2019
Citation4th International Congress Science and Technology for the Conservation of Cultural Heritage (2019)
AbstractNon-invasive, high resolution 3D analysis techniques are very much sought for the characterization of multilayer, multicomponent substrates, as the ones often encountered in artworks and objects of cultural heritage. The nonlinear optical interaction of ultrashort laser pulses with a sample is the basis of several modalities of nonlinear optical microscopy (NLOM), a family of techniques which has been recently introduced for the study of paintings, parchment, textiles and corrosion layers over metallic substrates among others (i.e. Phys. Chem. Chem. Phys., 2017, 19, 22836). NLOM relies on near-IR, femtosecond laser excitation of transparent materials to simultaneously induce, with 3D micrometric resolution and depending on the optical properties of the sample, multiphoton excitation fluorescence (MPEF) and second and third harmonic generation (SHG, THG) signals. MPEF emission is related to the sample chemical composition, SHG identifies the presence of non¿centrosymmetric structures and THG allows imaging interfaces between optically dissimilar materials. Here, we present the application of the MPEF modality of NLOM to study painting substrates (varnished painting mock-ups and model acrylics paints) using a custom-made laser scanning microscope (set-up sketched in the Figure) based on a Ti:Sapphire laser oscillator (wavelength of 800 nm, repetition rate of 80 MHz and pulses of 70 femtoseconds). MPEF measurements were supported by morphological and chemical assessment of paint layers by optical coherence tomography (OCT) and by linear laser-induced fluorescence and micro-Raman spectroscopies. The results obtained pave the way for further non-linear stratigraphic investigations on paintings. Acknowledgements This work is funded by projects IPERION-CH (H2020-INFRAIA-2014-2015, nº 654028), Geomateriales 2- CM (S2013/MIT-2914) and CTQ2016-75880-P (MINECO, Spain).
DescriptionTechnoHeritage 2019, Seville, March 26-30, 2019
Appears in Collections:(IQFR) Comunicaciones congresos
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