Very high sensitivity laser gyroscopes for general relativity tests in a ground laboratory

Two ring laser gyroscopes are being developed by the INFN in view of fundamental Physics applications. The scope of this activity is to `fill the gap' between the present state of the art technology and the requirements in sensitivity and accuracy needed for general relativity tests. The first prototype, called GP2 and located at INFN Pisa, is dedicated to the interferometric control of the ring laser cavity form factor. The second prototype, called GINGERino, is a larger ring laser located deep underground (INFN LNGS) and has the scope of characterizing the low frequency rotational noise of the site. We show the most recent results of the two experiments.