Showing papers by "Marco Bazzan published in 2009"
TL;DR: In this article, high resolution x-ray diffraction is used for the characterization of short period structures in lithium tantalate, allowing to obtain in a nondestructive fashion information such as the average domain period, the domain wall inclination, and the overall structure quality.
Abstract: Domain engineering technology in lithium tantalate is a well studied approach for nonlinear optical applications. However, for several cases of interest, the realization of short period structures (<2 μm) is required, which make their characterization difficult with standard techniques. In this work, we show that high resolution x-ray diffraction is a convenient approach for the characterization of such structures, allowing us to obtain in a nondestructive fashion information such as the average domain period, the domain wall inclination, and the overall structure quality.
7 citations
TL;DR: In this paper, the photorefractive properties of the Fe:LN film were studied by confocal Micro-Raman spectroscopy and the presence of unexpected lines in the Raman spectra of the samples was detected and attributed to the activation by the photoinduced space charge field.
Abstract: Fe in—diffusion was performed by depositing a Fe film on X-cut LN substrates by sputtering and subsequent annealing in a controlled atmosphere. The photorefractive properties of the Fe:LN film were studied by confocal Micro–Raman spectroscopy. The presence of unexpected lines in the Raman spectra of the samples was detected and attributed to the activation by the photoinduced space charge field which is also the cause of the photorefractive effect. The results in Fe-doped samples are compared to those recorded in nominally pure congruent crystals.
3 citations
TL;DR: In this article, compositional and photorefractive properties at the surface of iron doped lithium niobate crystals prepared by thermal diffusion in oxygen atmosphere of a thin film deposited by magnetron sputtering are investigated.
Abstract: Iron-doped lithium niobate crystals attract great attention for practical applications such as holographic storage systems, all-optical photonic devices and reconfigurable narrow band holographic filters. In this work we present some preliminary experimental results on the investigation of compositional and photorefractive properties at the surface of iron doped lithium niobate crystals prepared by thermal diffusion in oxygen atmosphere of a thin film deposited by magnetron sputtering. In particular both the Secondary Ion Mass Spectrometry and confocal polaron microluminescence are exploited.
1 citations
01 Jan 2009
TL;DR: In this paper, a theoretical description of the scattering process from a PPLN is presented, in order to evidence both the technique potentialities and the limits, and some special cases of scientific interest are reviewed such as: the structural characterization of sub-micrometric ppln crystals realized by interference technique and of Ppln grown by the Czochralski off-center technique.
Abstract: High Resolution X-Ray Diffraction (HRXRD) technique is non-destructive method to investigate the structural properties of Periodically Poled Lithium Niobate crystals. They, in fact, can be viewed as crystals with a periodic modulation of the inner cell structure and a shift of the cells due to the presence of both static deformations induced by the poling process and random strains due to defects. HRXRD, therefore, can be exploited to investigate the spontaneous polarization profile and the presence of lattice distortions, allowing the quantitative determination of the domain period, domain shape and the eventual domain wall inclination. To these aims, a theoretical description of the scattering process from a PPLN is however necessary and will be briefly outlined. In order to evidence both the technique potentialities and the limits, some special cases of scientific interest will be reviewed such as: the structural characterization of sub-micrometric PPLN crystals realized by interference technique and of PPLN grown by the Czochralski off-center technique.
14 Jun 2009
TL;DR: Solitonic waveguide can be written in any point of the volume of the host material, their configuration can be dynamically changed and the induced refractive index variation is optimized Furthermore waveguides are monomodal and propagation losses are much lower than what can be obtained with the other technologies as discussed by the authors.
Abstract: Solitonic technology offers many advantages for the realization of waveguides as they can be written in any point of the volume of the host material, their configuration can be dynamically changed and the induced refractive index variation is optimized Furthermore waveguides are monomodal and propagation losses are much lower than what can be obtained with the other technologies
01 Jan 2009
TL;DR: In this paper, a theoretical description of the scattering process from a PPLN is presented, in order to evidence both the technique potentialities and the limits, and some special cases of scientific interest are reviewed such as: the structural characterization of sub-micrometric ppln crystals realized by interference technique and of Ppln grown by the Czochralski off-center technique.
Abstract: High Resolution X-Ray Diffraction (HRXRD) technique is non-destructive method to investigate the structural properties of Periodically Poled Lithium Niobate crystals. They, in fact, can be viewed as crystals with a periodic modulation of the inner cell structure and a shift of the cells due to the presence of both static deformations induced by the poling process and random strains due to defects. HRXRD, therefore, can be exploited to investigate the spontaneous polarization profile and the presence of lattice distortions, allowing the quantitative determination of the domain period, domain shape and the eventual domain wall inclination. To these aims, a theoretical description of the scattering process from a PPLN is however necessary and will be briefly outlined. In order to evidence both the technique potentialities and the limits, some special cases of scientific interest will be reviewed such as: the structural characterization of sub-micrometric PPLN crystals realized by interference technique and of PPLN grown by the Czochralski off-center technique.