A　Gaussian　beam　is　often　used　as　the　source　for　Bessel　beam　generation;　however,　its　Gaussian　intensity　profile　results　in　a　tapered　edge　along　the　propagation　direction.　To　address　this　issue,　a　flat-top　beam　is　employed　to　generate　a　uniform　intensity　profile,　theoretically　achieving　an　ideal　working　distance　in　non-diffracting　zones.　The　flat-top　beam　is　shaped　from　a　point　light　source,　expanded　by　a　convex　lens,　and　then　homogenized　by　an　aspherical　lens　to　achieve　a　flat-top　beam　with　an　evenness　rate　of　93%.　The　achievement　of　a　long　working　distance　has　been　demonstrated　through　simulations　and　experiments.　Simulation　results　indicate　that,　for　the　same　beam　width,　the　flat-top　beam　generates　a　33%　longer　working　distance　compared　to　a　Gaussian　beam　and　exhibits　a　＇steep　edge＇　along　the　propagation　axis.　Experimentally,　the　method　extended　the　application　to　a　remarkable　2.4　mm,　compared　to　a　Gaussian-generated　Bessel　beam　with　a　full　width　at　half　maximum　(FWHM)　of　about　1.8　mm.　A　beam　profiler　also　detected　a　sharper　intensity　edge,　sharpening　the　FWHM　edge　width　to　0.1　mm.　After　optimizing　details　such　as　refining　the　axicon　vertex　angle　to　reduce　intensity　ripple　along　the　propagation　axis　and　smoothing　the　aspherical　lens　surface　to　eliminate　mid-frequency　interference,　this　solution　was　applied　to　a　laser　system　for　cutting　float　glass,　operated　by　a　355　nm　picosecond　solid-state　laser.　A　high-quality　ultraviolet　(UV)　Bessel　beam　with　a　cutting　depth　of　2.2　mm　was　achieved,　and　the　sharp　intensity　profile　optimized　the　cross-section　roughness.　Detected　by　a　3D　profilometer,　the　minimum　surface　roughness　was　reduced　from　3.32　μm　to　1.94　μm.　This　method　shows　promising　prospects　for　efficient　and　high-quality　optical　glass　cutting.　©　2025　SPIE.