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. 2022 Apr 29;11:120. doi: 10.1038/s41377-022-00807-7

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© The Author(s) 2022

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Fig. 4 — a Schematic of the lab frame (xyz) and the crystal frame (x_cy_cz_c). b Electric field distribution of the HE21_b mode of the NW in the yz plane, and its x, y, and z components. c Calculated second-order nonlinear polarization according to the electric field of the HE21_b mode and second-order nonlinear susceptibility tensor of the GaAs. d Polarization dependence of the frequency-doubled lasing mode (blue dots) and its theoretical prediction (blue line), where the corresponding polarization dependence of the fundamental lasing mode is also shown (red dots for experimental results and red line for theoretical calculation)