The diffraction efficiency of <i>M</i> holograms superimposed in the volume of the recording medium is proportional to 1/<i>M</i><sup>2</sup>. We present a method, based on nondestructive localized holograms in a doubly doped LiNbO<sub>3</sub> crystal, that allows us to also record <i>M</i> holograms in the same volume without an exposure schedule or a diffraction efficiency that has 1/<i>M</i> dependence. We compare experimentally the final diffraction efficiency obtained with the localized and distributed recording methods.
© 2000 Optical Society of America
Christophe Moser, Irena Maravic, Benjamin Schupp, Ali Adibi, and Demetri Psaltis, "Diffraction efficiency of localized holograms in doubly doped LiNbO3 crystals," Opt. Lett. 25, 1243-1245 (2000)