In this presentation, we start with a brief theoretical introduction to mutual and self coupling phenomena in laser oscillator, and then describe in details two applications. The first is self-mixing interferometry for measurements of dimensional quantities (displacement, distance, vibration, and angle) and physical quantities (coupling factors, line width, alfa-factor). In this case, the laser undergoes self-injection at weak level, leading to an amplitude and frequency modulation driven by external optical path. The second application is optical chaos, which is generated by the laser source at strong level of injection. We describe mutual and self-injection generation of chaos, and the first step of development to cryptography, that is, synchronization. Then, we will review several schemes of coding and decoding of information, i.e., chaotic masking and CSK (chaos shift keying) and how they can be implemented, along with theoretical and experimental results carried out recently.
S. Donati is full Professor at University of Pavia since 1980. He authored 2 books (Photodetectors, Prentice Hall 1999 and Electrooptical Instrumentation, Prentice Hall 2004), about 250 papers in Journal and Conference Proceedings, and has been the Guest Editor of a dozen Special Issues (JSTQE, JoO-A, Opt.Engineer., JQE, etc.). His seminal papers on self-mixing interferometry and optical chaotic cryptography have totaled 430 citations. He is a Fellow of IEEE and of OSA. Has founded and has been the Chair of the LEOS Italian Chapter. Has been LEOS VP Region 8 membership and is presently BoG member of the LEOS and Vics Chair, IEEE Italy Section.
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