Quantum Optics and Quantum Information Group




Title:  Double slit experiment using a Hanbury Brown-Twiss type interferometer with partially 
        coherent radiation
: Itamar Vidal S. de Lima (Universidade Federal de Alagoas)


The properties of incoherent and partially coherent light radiation have been studied in connection with so-
called ghost imaging effect [1]. The images measured in ghost imaging configuration using pseudo-thermal light
sources are strongly dependent on the spatial coherence properties of the incident light. It has been theoretically
observed that the quality and visibility of the ghost interference fringes are strongly influenced by the sources
transverse size and transverse coherence width. The theoretical model used to describe this behavior considers
that the light source is a typical partially coherent radiation source, a Gaussian Schell-model source.
The pseudo-thermal light source was built passing an Argon ion laser, operating at 514 nm, through a slow
rotating ground-glass disk. A lens was used to change the transverse size of the source by varying the size of
the beam into the ground-glass disk. We experimentally analyze the influence of transverse size of the source,
keeping the transverse coherence width constant, in the second-order interference pattern formation using the
ghost scheme. We show that the quality or visibility of the interference fringes increases when the sources
transverse size is increased. Our results are in good agreement with the prediction reported in Ref. [2].

[1] A. F. Abouraddy, B. E. A. Saleh, A. V. Sergienko, and M. C. Teich, J. Opt. Soc. Am. B 19, 1174 (2002);
Y. H Shih, IEEE J Sel. Top. Quant. 13, 1016-1030 (2007).
[2] Yangjian Cai and Shi-Yao Zhu, "Ghost interference with partially coherent radiation," Opt. Lett. 29,
2716-2718 (2004);

Ciclo de Seminário de Óptica Quântica

DATA: Sexta-feira, 09 de maio de 2008
LOCAL: Sala de seminários J. A. Swieca ou  sala de seminários em frente a chefia.