Fig. 1. Optical path diagram of ultra-high-order LG mode laser

Fig. 2. f_{2_eff} versus h

Fig. 3. Wp,m/w0, Wmax/w0, and Wmax/Wp,m versus m

Fig. 4. Spot patterns of typical high-order LG_0,±m mode laser obtained at pump power of 2.06 W

Fig. 5. m versus d₃

Fig. 6. Output power curves of LG_0,±m mode laser under different m

Fig. 7. Stability of output power of LG_0,±138 and LG_0,±230 mode laser in 60 s