Focal shift of flattened Gaussian beams passing through a spherically aberrated lens
Abstract:Starting from the Collins formula, the focal shift of flattened Gaussian beams (FGBs) passing through a spherically aberrated lens is studied in detail. It is found that for FGBs the focusing without focal shift, inverse focal shift and beyond conventional diffraction limit can be achieved by a suitable choice of the Fresnal number N w , spherical aberration kS 1, and beam order N.
Document Type: Original Article
Publication date: 2002-08-01