Phase effects in laser-induced electron-positron pair creation

Probability rates of electron-positron pair creation in collisions of a relativistic nucleus with a two-color laser field are calculated using the S-matrix approach. The case when both components of the laser field have commensurate frequencies and comparable strengths is considered. Pronounced interference effects are observed in angular distributions of created particles as well as in the total probability rates of pair production. These interference effects show a significant phase dependence of the pair-creation process.