Figure 1 | Scientific Reports

Figure 1

From: Deep-ultraviolet second-harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization in photonic crystal fiber

Figure 1

(a) The effective refractive index curves of the fundamental and SH modes calculated as functions of the wavelength. The inset shows the cross-sectional structure of the PCF used. (b) The calculated group-velocity dispersion profile of the fundamental mode with the zero-dispersion wavelength at 849 nm. The red solid dots correspond to the dispersion values measured by the pulse time-delay method. The insets 1 and 2 show the three-dimensional coupled-field profile observed at the input end of the PCF by a CCD camera and the output spatial far-field intensity distribution of the incident pump in the form of the fundamental mode, respectively.

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