New infection of truncation parameter on focal shift and focal switch is investigated when studying Laguerre-Gaussian (L-G) beams passing through an aperture-lens separate optic system.

• 摘要以拉盖尔－高斯(L-G)光束通过光阑－透镜分离的光学系统为例，研究了截断参数对焦移量和焦开关的影响。