Opto-digital multiplexing experimental procedure by diffuser rotations in a joint transform correlator architecture

CARLOS RIOS; EDGAR RUEDA; RODRIGO HENAO; JOHN FREDY BARRERA; ROBERTO TORROBA

Lima

Congreso; VII Reunión Iberoamericana de Óptica (VII RIAO) y X Encuentro Latinoamericano de Óptica, Láseres y sus Aplicaciones (X OPTILAS); 2010

Pontificia Universidad Católica del Perú

Optical cryptography clearly evolved from the initial 4f architecture to more complex schemes. This evolution included sophisticated encrypting alternatives to become more secure the involved scheme. Among the new proposals, we find the Joint Transform Correlator (JTC) architecture together with a storing digital holography setup the most promising for developing practical techniques. In this contribution, we present the experimental operation of a multiplexing method, where the rotation of the diffuser located at the input plane of the JTC opens the multiplexing capability. The digital recording and processing allows the practical implementation with a reasonable quality. We first found the minimal rotation angle to avoid decrypted images cross-talking. Finally, we obtained the experimental results that verify our approach. We also give a detailed explanation on both the optical scheme, and the digital holographic procedure.