Experimental and theoretical study on the reconstruction of focused high order Bessel-Gauss beam
聚焦高阶Bessel-Gauss光束重建的理论和实验研究

Reconstruction of focused high order Bessel-Gauss beam by using thin lens is proposed. Based on the diffraction theory, reconstruction behavior of focused high order Bessel-Gauss beam is analyzed. The three-dimensional optical intensity distribution and the cross-section optical intensity distribution of the high order Bessel-Gauss beam focused by first thin lens, and then reconstructed by the second thin lens are numerical simulated. Result shows that the high order Bessel-Gauss beam passing through the single thin lens can generate Bottle beam, and the bright ring is obtained at focus. To rectify the beam divergence after focus, another thin lens is introduced at suitable position. After that, the beam keeps the Bessel distribution. Experiment is conducted, and experimental results are in agrement with the theoretical analyses. Research result shows its significance in providing a guidance for optical tweezers, particle trapping and controlling.