Abstract:
Laser beams with high-energy densities are desired for both fundamental research and applied applications. We
present a numerical study on the generation of high-energy densities by sidelobe suppression in the far-field
intensity distribution of phase-locked lasers. The method relies on modifying the combined field distribution of
phase-locked lasers to obtain uniform amplitude and phase distributions in a near-field plane, which enables the
formation of a high-energy density main central lobe (zeroth order) in the far field. The method is applied to various
one-dimensional (1D) and two-dimensional (2D) array geometries, such as square, triangular, Kagome, random,
and 1D ring. The results show that for in-phase-locked lasers in 2D array geometries, the diffraction efficiency of
the high-energy density region (zeroth-order lobe) can be increased in the range of 90%–95%. For in-phase-locked
lasers in a 1D ring array, the maximum diffraction is found to be ∼75%. Further, the effects of the range of phase
locking, system size, as well as topological defects are examined on diffraction efficiency. The method is also applied
to an out-of-phase-locked laser in the square array, and a high-energy density output beam is obtained.
