Schwinger effect and possibility of its observation with the help of optical and roentgen lasers

The probability W of the e+e- pairs production from the vacuum under the effect of the intensive alternating electric current, created through powerful lasers of the optical or X-ray range, is calculated. Two specific areas: γ << 1 and γ >> 1, where γ constitutes the adiabatic parameter, are considered; it is shown that with γ growth the W probability sharply increases (by one and the same value of the F field intensity). The dependence of the W probability and the electron and positron pulse spectrum on the laser pulse from is discussed in detail. The numerical calculations are carried out for the case of the laser pulse with the Gaussian envelope and also for some pulse fields