  Production of particle-antiparticle pairs by a high-energy probe photon
propagating through a high-intensity laser field is considered in the
nonperturbative interaction regime. The laser field consists of a strong
low-frequency and a weak high-frequency component. While for each component
alone photoproduction of pairs is strongly suppressed, we show that their
combination can largely amplify the pair production probability by facilitating
to bridge the energetic barrier of the process. Our predictions can be tested
by utilizing presently available high-intensity laser devices.
