Giovanni Pierattini

TL;DR: In this paper, the propagation of a cw TE polarized Ar + laser beam in a symmetric planar waveguide having a nematic liquid crystal core is studied both theoretically and experimentally as a function of an external voltage.

TL;DR: In this article, the authors describe a technique based on fast Fourier transform and least squares fit for automated analysis of moire fringe patterns for accurately measuring the focal length of lenses, and they show that in the latter case by means of the described technique it is possible to determine the moire spatial frequency by a simple and fully automated procedure.

TL;DR: In this article, the simultaneous fabrication of two-dimensional submicron engineered domain patterns on both crystal faces, in congruent lithium niobate, was reported, which could be useful for short-wavelength frequency conversion and Bragg gratings applications.

TL;DR: This work proposes a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations that becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration.

TL;DR: In this paper, an experimental observation of the photophoretic motion of micro-sized particles suspended in air has been performed using the radiometric force from a continuous laser beam, which was used to trap the particles in a confined optical field and to levitate them.