Fig. 1. Normalized far-field distribution on exit surface of 19-beam hexagonal array

Fig. 2. Influence of truncation factor on power in bucket

Fig. 3. Power ratios in bucket within different tilt angle ranges for unit beam

Fig. 4. Normalized far-field distributions corresponding to random phase residuals. (a) Without phase difference; (b) phase difference within range of 0-π/6

Fig. 5. Power ratios in bucket corresponding to different phase residual ranges

Fig. 6. Normalized far-field distributions under different turbulence conditions. (a) Weak turbulence; (b) moderate turbulence; (c) strong turbulence