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With a home-built multiphoton\u00a0microscope setup developed to study harmonics generation, we map the second and third-harmonic intensities as a function of position in the sample, pump power and polarization angle, for single- and few-layers flakes of WSe<jats:sub>2<\/jats:sub>. We register a value of |<jats:italic>\u03c7<\/jats:italic><jats:sup>(3)<\/jats:sup><jats:sub>s<\/jats:sub>|\u2006\u2248 0.9\u2006\u00d7\u200610<jats:sup>\u221228<\/jats:sup>\u2006m<jats:sup>3<\/jats:sup> V<jats:sup>\u22122<\/jats:sup> at a fundamental excitation frequency of <jats:italic>\u210f\u03c9<\/jats:italic>\u2009=\u20090.8\u2009eV, which is comparable in magnitude to the third-harmonic susceptibility of other group-VI transition metal dichalcogenides. The simultaneously recorded sheet\u00a0second-harmonic susceptibility is found to be |<jats:italic>\u03c7<\/jats:italic><jats:sup>(2)<\/jats:sup><jats:sub>s<\/jats:sub>| \u2248 0.7 \u00d7 10<jats:sup>\u221219<\/jats:sup>\u2009m<jats:sup>2<\/jats:sup>\u2009V<jats:sup>\u22121<\/jats:sup> in very good agreement on the order of magnitude with recent reports for WSe<jats:sub>2<\/jats:sub>, which asserts the robustness of our values for |<jats:italic>\u03c7<\/jats:italic><jats:sup>(3)<\/jats:sup><jats:sub>s<\/jats:sub>|.<\/jats:p>","DOI":"10.1038\/s41598-018-28374-1","type":"journal-article","created":{"date-parts":[[2018,6,27]],"date-time":"2018-06-27T13:20:41Z","timestamp":1530105641000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":74,"title":["Characterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide"],"prefix":"10.1038","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3184-9424","authenticated-orcid":false,"given":"Henrique G.","family":"Rosa","sequence":"first","affiliation":[]},{"given":"Yi Wei","family":"Ho","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5945-8276","authenticated-orcid":false,"given":"Ivan","family":"Verzhbitskiy","sequence":"additional","affiliation":[]},{"given":"Manuel J. 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