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 ...