Fig. 2: Lasing characteristics and mode identification of the NW laser. | Light: Science & Applications

Fig. 2: Lasing characteristics and mode identification of the NW laser.

From: Self-frequency-conversion nanowire lasers

Fig. 2

a, b Emission spectra of the NW with increasing pump fluences (a) and the normalized spectra map (b). c Integrated lasing peak intensity (red dots) and the corresponding FWHM (blue dots) of the emission spectra versus pump fluence on a log–log plot. The ASE region is highlighted by the light green shaded area. d Optical images of the NW emission below (left) and above (right) the lasing threshold. e Calculated threshold gain spectra for supported guided modes of the core/shell NW with a diameter and length of 410 nm and 4.4 μm, respectively. f Polarization dependence plots of possible lasing modes calculated from 3D FDTD simulations and the experimentally measured data

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