Abstract: An absolute gravimetric measurement device including, in succession, a laser system, a supporting surface of the laser system, an ultra-vacuum system, a retroreflective mirror, and a seismic attenuation system. The seismic attenuation system includes an upper plate including a hole above which the retroreflective mirror is kept suspended by at least three metallic blades including first ends constrained to a periphery of the plate and second ends above the hole in correspondence with the retroreflective mirror, the metallic blades configured to form a spring-antispring geometry for damping vibrations of the retroreflective mirror. The absolute gravimetric measurement device also includes a mechanism leveling the retroreflective mirror integral with the seismic attenuation system and a radial constraining mechanism between the retroreflective mirror and the upper plate.

Abstract: A device comprising a laser system (13) for generating a plurality of laser bands, such laser bands being each conformant at a frequency equal to an energetic transition between a hyperfine level (F1, F2) of a fundamental state (52Si/2) and a hyperfine level (F?2,F?3) of an excited state (52P3/2) of said plurality of atoms, wherein the laser system (13) comprises a first laser source (23) stabilized in frequency which emits a first band (30), a second laser source (24), connected in phase with the first laser source (23), which emits a repumping band (37), said first (23) and second (24) laser source being coupled with means for generating secondary bands (29) capable of generating a detection band (31), a band for producing the three-dimensional magneto-optical trap (32), a thrust band (33) and a reference band (36), said laser system also comprising means for generating Raman bands (39) capable of producing two exiting superimposed Raman interferometric bands (41) starting from the reference band (36), the

Abstract: A method for measuring and two-dimensional mapping of electro-optical properties of materials using a Reflective Grating Interferometer (RGI) includes projecting a substantially coherent and monochromatic electromagnetic beam subjected to a homogeneous electrical field so the beam is enlarged to have a two-dimensional cross section comparable with dimensions of the material, dividing the electromagnetic beam into one part that crosses the material and another part that travels undisturbed, recomposing the two beams on a recombination element of the RGI, detecting the recombined beam by a device suited to two-dimensional detection of such beam. The method also includes: E. obtaining phase variation ?ø(x,y) between the divided beams; F. varying the applied electrical field value and repeating the detection steps; G.