Pyrex tube for the excitation of the He-Ne plasma.
Detail of a ring cavity corner; the lever system controlled by micrometric screws and used to align the ring cavity is shown.
One of the four corner mirror holders installed on the granite slab.
GINGERino prototype installed at LNGS underground facility; a thermal-acustic shielding encloses it.
Spot laser on one of the four corner mirrors.