Visibility and phase of the atom interferometer comprised of three traveling laser beams

Summary form only given. Atom interferometers are expected to be used as sensitive detectors in a variety of precision measurements; several versions were presented for various purposes until now. We have developed an atom interferometer comprised of a Ca thermal atomic beam and three copropagating traveling laser beams. The interferometer is a simple single interferometer and is expected to be of higher visibility than the atom interferometer with four laser beams.