Fig. 1. Configuration of the concave-flat cavity for implementing the off-axis pumped Nd:YVO4/Cr4+:YAG passively Q-switched lasers in a degenerate resonator.

Fig. 2. Wave patterns |ΨmoM(x,y,z;ϕo)| inside the cavity for the cases of (a) ϕo=0 and (b) ϕo=π/10 with mo=30 and M=5. Right-hand side: transverse patterns of the emitted beams at z=2L.

Fig. 3. Numerical results for the wave patterns |Ψ˜moM(+)(r,ϕ,z;ϕo)| with a fixed M=2 for three cases of mo=5, 10, and 15. Second row: numerical results for the phase structures.

Fig. 4. (a) Average output power versus incident pump power for lasing modes excited at Δy=0.48, 0.55, and 0.97 mm. (b) Dependence of the lasing mode on the pump power.

Fig. 5. (a) Pulse repetition rate versus incident pump power for lasing modes shown in Fig. 4(a). (b) A typical oscilloscope trace.

Fig. 6. Experimental results (first row), numerical calculations (second row), and numerical phase structures (third row) for the patterns of the converted beams at z=2L for the lasing modes shown in Fig. 4(b) at a pump power of 3.8 W.