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Item merged in doublecheck by Felipe Arakaki (arakaki@reitoria.unesp.br) on 2015-12-14T11:23:02Z Item was identical to item(s): 69895, 40073 at handle(s): http://hdl.handle.net/11449/70413, http://hdl.handle.net/11449/40575

A novel optical setup for imaging through reflection holography with Bi12TiO20 (BTO) sillenite photorefractive crystals is proposed. Aiming a compact, robust and simple optical setup the lensless Denisiuk arrangement was chosen, using a He-Ne red laser as light source. In this setup the holographic medium is placed between the light source and the object. The beam impinging the crystal front face is the reference one, while the light scattered by the surface is the object beam in a holographic recording by diffusion. In order to allow the readout of the diffracted wave only and to keep the setup simplicity a polarizing beam splitter cube (PBS) was positioned at the BTO input. The reference beam is s-polarized (polarization direction perpendicular to the table top) and the crystal. 〈001〉-axis is rotated by an angle γ with respect to the input polarization in order to make the transmitted object beam and the diffracted beam to have orthogonal polarizations. While the transmitted wave is reflected by the PBS at a right angle, the diffracted wave carrying the holographic reconstruction of the object passes through the PBS, being collected by a positive lens in order to form the holographic image at a CCD camera. The holographic recording with the grating vector is parallel to the 〈100〉-axis. An expression for the diffracted wave intensity as a function of γ was derived, and this relation was experimentally investigated. © 2008 American Institute of Physics.

Laboratório de Óptica Aplicada Faculdade de Tecnologia de São Paulo CEETEPS - UNESP, Pça Cel Fernando Prestes, 30, São Paulo - SP, CEP 01124 060

Instituto de Física Universidade Federal de Goiás, Caixa Postal 131, 94001-970GOIÂNIA - GO

Laboratório de Sistemas Integráveis PoIi-USP Cidade Universitária, Av. Prof. Luciano Gualberto, 158, Trav. 3, São Paulo - SP, CEP 05508-900

Laboratório de Óptica Aplicada Faculdade de Tecnologia de São Paulo CEETEPS - UNESP, Pça Cel Fernando Prestes, 30, São Paulo - SP, CEP 01124 060