Fig. 1. Nonlinear mirror structure of double-crystal second harmonic generation

Fig. 2. Nonlinear reflectivity curves. (a) Nonlinear reflectivity curves corresponding to LBO crystals of different thicknesses;

Fig. 3. Schematic diagram of NLM mode-locked experimental device for large-core crystal waveguide

Fig. 4. Experimental results of NLM mode-locked laser with large-core crystal waveguide. (a) Variation curves of output power of mode-locked experiment with the absorption power of pump light; (b) output laser spectral curve in mode-locked experiment; (c) CWML pulse sequence; (d) RF spectrum diagram; (e) autocorrelation trace; (f) relationship between the output beam diameter and spatial position