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The focal switch of flattened Gaussian beams (FGBs) passing through an unapertured bifocal lens system is studied. Detailed numerical results are given. It is found that for the unapertured case by an appropriate choice of the optical system and beam parameters, the focal switch can take place. The physical analysis of the focal switch in the bifocal lens system is made. The focal switch of Gaussian...
The focusing of Gaussian beams by a spherically aberrated bifocal lens and related focal shift are studied. It is shown that the axial irradiance distribution, maximum irradiance along the axis and its position of focused Gaussian beams depend upon the Fresnel number, spherical aberration and focal length of the bifocal lens in general. A detailed analysis of the effect of spherical aberration and...
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