Fig. 1. Schematic diagram of instantaneous beam smoothing technique based on beat frequency of broadband laser

Fig. 2. Focal spot intensity distributions obtained by different techniques without CPP. (a) Dual-frequency monochromatic laser beat frequency technique; (b) broadband laser beat frequency technique

Fig. 3. Smoothing characteristics of different beam smoothing techniques. (a) Focal spot obtained by broadband laser beat frequency technique; (b) focal spot obtained by dual-frequency monochromatic laser beat frequency technique; (c) luminous flux contrast curve; (d) FOPAI curve; (e) PSD curve

Fig. 4. Luminous flux contrast curves under different laser bandwidths

Fig. 5. Spectra and luminous flux contrast curves for flat top and Gaussian broadband lasers under different bandwidths. (a) Spectra; (b) luminous flux contrast curves