Fig. 1. Experimental setup for harmonic self-mode-locked Nd∶YVO₄ laser. (a) Schematic; (b) photograph

Fig. 2. When Lcry*/Lcav*=1/3, 2/5, 3/7, schematic diagram of F-P cavity mode selection. (a1)‒(a3) Transmittance peak curves of F-P cavity and original longitudinal-mode spectra of resonator cavity; (b1)‒(b3) longitudinal mode spectra after mode selection

Fig. 3. Time domain simulation diagrams. (a) Lcry*/Lcav*=1/3; (b) Lcry*/Lcav*=1.03/3; (c) Lcry*/Lcav*=1.10/3

Fig. 4. Output power and beam quality values of four groups of lasers. (a) Average output power versus incident pump power (dot is data and line is fitted curve); (b) output beam quality

Fig. 5. Laser spectra of four groups of lasers. (a1)‒(d1) Lcry*/Lcav*=1/3; (a2)‒(d2) Lcry*/Lcav*=2/5; (a3)‒(d3) Lcry*/Lcav*=3/7

Fig. 6. Laser pulse trajectories of four groups of lasers. (a1)‒(d1) Lcry*/Lcav*=1/3; (a2)‒(d2) Lcry*/Lcav*=2/5; (a3)‒(d3) Lcry*/Lcav*=3/7

Fig. 7. Relationship between locking range of resonator optical length and optical length of gain medium (dot is data and line is fitted curve )

Fig. 8. Laser spectral drift and laser pulse amplitude fluctuations for first, second, and third harmonics. (a1)‒(c1) Laser spectral drift within 30 min; (a2)‒(c2) laser pulse amplitude fluctuation within 100 ns