6Th Ibero-American Conference Onoptics and 9Th Latin-American Meeting on Optics, Lasers and Applications, Riao/Optilas 2007, Date: 21 October 2007 through 26 October 2007, Location: Campinas, Sao Paulo, Sponsors: The State of Sao Paulo Research Foundation (FAPESP);The State University of Campinas (UNICAMP);The Physics Institute Gleb Wataghin (IFGW);The Brazilian Society of Physics (SBF);The National Council Sci. Technol. Development (CNPq)