Realization of a 3:2 optical frequency divider using a cw optical parametric oscillator

Summary form only given. The 3:1 optical frequency divider is one of the key devices to realize an all solid state frequency chain. We report here the 3:1 division with a cw optical parametric oscillator in the visible and the first observation of the beat signal between the signal and the second harmonics (SH) of the idler; toward the realization of an truly phase coherent 3:1 optical frequency divider.