Fig. 1. Wavefront sensorless adaptive optics

Fig. 2. SR evolution curves of three index evaluation functions

Fig. 3. Comparison of laser beam cleanup simulation results by the four algorithms. (a) Images of far-field focal spot after correction based on traditional SPGD; (b) images of far-field focal spot after correction of SPGD based on adaptive gain optimization; (c) images of the far-field focal spot after correction based on wavefront sensing; (d) images of the far-field focal spot after correction of SPGD based on adaptive gain and joint index

Fig. 4. Comparison of convergence speed of three wavefront sensorless beam cleanup algorithms

Fig. 5. Aberration mode decomposition results. (a) Legendre polynomial fitting results; (b) mode coefficients

Fig. 6. Wavefront PV and RMS curves at 200 frames

Fig. 7. Schematic diagram of slab laser beam cleanup experiment

Fig. 8. Experimental results of slab laser beam cleanup. (a) Laser far-field focal spot before correction; (b) laser far-field focal spot after correction by the adaptive-gain-joint-index SPGD algorithm; (c) laser far-field focal spot aftercorrection by the wavefront adaptive system

Fig. 9. PIB curves in the laser far-field focal spot after correction

Table 1. Parameter of the slab laser beam cleanup simulation system