Figure 3
Phase-matching diagrams for the six SFWM processes with signal (a) and idler (b) arms displayed separately. Red and blue colors corresponds to x- and y-polarized signals, respectively. Points indicate the central wavelength of the measured spectra, while error bars represent their emission bandwidth. Solid lines correspond to the calculated phase-matching diagrams of each process. The vertical black line represents the pump at \(0.741\,\mu \)m and corresponds to the spectra shown in Fig. 4.
