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. 2017 Jun 5;8:15714. doi: 10.1038/ncomms15714

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Copyright © 2017, The Author(s)

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Generated multiphoton spectra with different input fluences, (b) optical image with marked grains (A1, A2, B1 and B2) and grain boundaries (GB1, GB2, GB3 and GB4), (c) experimental SHG image without analyser, (d) experimental SHG image with parallel polarized excitation and detection (as indicated by a double-headed arrow), (e) experimental THG image without analyser, (f) simulated SHG image without analyser, (g) simulated SHG image with parallel polarized excitation and detection (as indicated by a double-headed arrow) and (h) simulated THG image without analyser. Scale bars, 10 μm. Colour scale bars are the counts from photomultiplier tubes.