Creation of a sharper focus by using a rectified TEMp0 beam |
| |
| Authors: | A Hasnaoui M Fromager K Aït-Ameur |
| |
| Institution: | a Laboratoire d'Electronique Quantique, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumédiène, B.P. n°32, El Alia, 16111 Algiers, Algeriab Laboratoire d'Optique Appliquée, Université de Sétif, Cité Maâbouda, 19000 Sétif, Algeriac Centre de Recherche sur les Ions, les Matériaux et la Photonique, UMR 6252-CEA-CNRS-ENSICAEN-Université de Caen, ENSICAEN, 6 Boulevard Maréchal Juin, F14050 Caen, France |
| |
| Abstract: | The superresolution technique is usually used in optical imaging for its ability to make the central diffractive spot smaller than the Airy spot. In this paper, we apply the superresolution technique for transforming a symmetrical TEMp0 Laguerre-Gauss beam into a Gaussian intensity distribution in the plane of a converging lens. The beam shaping is achieved by an annular binary Diffractive Optical Element having a transmittance, alternatively equal to −1 or + 1, modelled on the p light rings of the incident beam. It is observed that the rectified TEM30 beam at focus has a focal volume 170 times smaller than that of a Gaussian beam. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
