Fig. 1. Experimental setup of intracavity SHG and SFG based on MgO∶PPLN OPO[28]

Fig. 2. Experimental setup for tunable UV generation in MgO∶PPLN OPO[29]

Fig. 3. Experimental setup of the tunable UV OPO[33]

Fig. 4. Experimental setup of dual-wavelength LBO OPO[40]

Fig. 5. (a), (b) SEM images of GaAs nanowires; (c) typical SHG signals excited by femtosecond laser at 1040 nm, 810 nm;(d) broadband SHG signal excited by supercontinuum pulses. The illustration is spectrum of SC pulses[52]

Fig. 6. (a) Experimental setup of SFG in GaAs nanowires; (b) SFG signals generated by the 1048 nm femtosecond laser and 1416~1770 nm tunable OPO[53]

Fig. 7. SEM images of the all-solid PBGF and seven-core PCF[56-57]

Fig. 8. (a) DOS map calculated for the periodic cladding of the all-solid PBGF; (b) transmission curve measured by coupling a supercontinuum source to the all-solid PBGF; (c) fundamental mode LP01 at 1060 nm transmitted in the first bandgap; (d) higher order mode LP11 of the dispersive wave at 640 nm; (e) coexistence of the LP11 mode of the dispersive wave at 640 nm (red light) and 560 nm (yellow light). (f) output spectra of the supercontinuum at different input powers[80]

Fig. 9. Spectra of the output SC for a fiber length of (a) 5 cm and (b) 20 m. The inset of (a) shows the enlarged view of a normalized SC spectrum in the range from 730 nm to 800 nm[82]

Fig. 10. (a) Far field profiles of HE13 and HOUVMs with different-polarization input pulse coupled into the high nonlinear PCF; (b) right, numerical modeling results of 4 HOUVMs observed at the output of PCF when the polarization of input pulse is changed; left, numerical modeling results of 4 lower older modes (mode 3, mode 5, mode 7, mode 9) produced when different-polarized input pulse is coupled into PCF; (c) the measured spectrum with different-polarization input pulse coupled into PCF and the phase