MODELLIZZAZIONE E OTTIMIZZAZIONE DI UN SISTEMA A REINIEZIONE OTTICA PER L'IMAGING CON APPLICAZIONE ALLA MICROSCOPIA

The Light Optical Feedback Imaging technique is a new imaging technique which considers the use of a coherent light source to investigate the structure of complex targets. Moreover it represents some technological advantages respect the traditional microscope and tomography techniques. The basic principle is the same of the feedback heterodyne interferometer, but at the same time the laser cavity is the source and the detector. Besides, considering the laser properties, the technique is shot noise limited and the reflected signal is maximized in condition of self-aligned setup. This is a great advantage because it represents an easy and inexpensive imaging technique. For these reasons it is applicable to many aims such as the biomedical science, the diagnostic and the solid state study. In any case the method is in continue evolution and in literature there are not many theoretical model which can explain the obtained results regarding the laser-target interaction for complex target structure. In this sense the purpose of this work is to find a better description for what concerns the target and the laser propagation models, in order to characterize a new system offering a best resolution. The discussed arguments describe the evolution of this model. The thesis work has been developed in collaboration with the group of Optique, Lasers et Applications (OLA) of the Laboratoire de Spectrometrie Physique (SPECTRO-CNRS) and the Université Joseph Fourier of Grenoble during an Erasmus period.