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. 2022 Jul 8;11:216. doi: 10.1038/s41377-022-00915-4

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© The Author(s) 2022

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Fig. 4 — a Modulated THG signal as a function of the time delay under different incident powers (upper panel: the power of the linearly polarized beam is fixed; lower panel: the power of the circularly polarized beam is fixed). b THG power dependence on the σ⁺ circularly- (linearly-) polarized beam while the power of the other beam with the linear (σ⁺ circular) polarization is ~1 μW. c THG’s ellipticity dependence on the σ⁺ circularly- or linearly-polarized beam while the power of the linearly- (σ⁺ circularly-) polarized beam is ~1 μW. Note that the measured average power of the incident beam is proportional to m².