Experimental activity toward GINGER (gyroscopes IN general relativity)

Abstract

We report about the recent progresses toward the development of a laser gyroscope detector for a ground based measurement of the Earth's relativistic frame dragging. The main part of the presented activity involves the control of the systematic errors related to the fluctuation of the cavity geometry and the active medium parameters. A new square ring laser 1.6 m in side, named "GP2", has been built with the aim of setting its cavity shape as close as possible to a "perfect square".This kind of setup will be the building block for an ultra-sensitive tri-axial rotation detector aiming at fundamental Physics applications