Generation of optical beams with angular momentum

摘要

In this paper we describe the fabrication of reflect ve spiral phase plates with a deposition system. This plate was used to transform Gaussian beams into Laguerre-Gauss beams with angular momentum. These beams are characterized by a helical wave front and zero intensity at center. By focusing a femtosecond Laguerre-Gauss beam with an axicon, we have produced surface modification in a BK7 glass sample.