Simultaneous generation and robustness of multiple Bessel beams via phase-only holographic beam shaping

Abstract

We present a computational investigation of the simultaneous generation of multiple Bessel beams using computer-generated phase holograms computed using a Modified Gerchberg−Saxton Algorithm (MGSA) employing angular spectrum propagation. Phase holograms encoding three simultaneous Bessel beams are designed for a phase-only spatial light modulator (SLM). Reconstruction quality was evaluated using Linfoot's criteria, yielding fidelity F = 0.77, structural content C = 0.33, and correlation quality Q = 0.55, with an ~11% broadening of the central lobe. Axial propagation simulations show a depth of field of ~9.5 mm. Robustness to SLM pixel defects is assessed via random binary masking revealing gradual degradation with no abrupt failure, with beams remaining identifiable up to 40−60% pixel loss.