  Non-diffracting beams, notable for their self-healing properties,
high-localized intensity profiles over extended propagation distances, and
resistance to diffraction, present significant utility across various fields.
In this letter, we present a versatile and highly efficient non-diffracting
beams (NDBs) generator predicated on the Fourier transformation of the focal
plane field produced through the free lens modulation. We demonstrate the
experimental generation of high-quality Bessel beams, polymorphic generalized
NDBs, tilted NDBs, asymmetric NDBs, NDBs array and specially structured beams
formed by the superposition of co-propagating beams. The versatile generalized
NDBs generator is anticipated to find applications in laser processing, optical
manipulation, and other fields.
