  Experimental efforts toward the detection of the nonperturbative strong-field
regime of the Breit-Wheeler pair creation process plan to combine incoherent
sources of GeV $\gamma$ quanta and the coherent fields of tightly focussed
optical laser pulses. This endeavour calls for a theoretical understanding of
how the pair yields depend on the applied laser field profile. We provide
estimates for the number of produced pairs in a setup where the high-energy
radiation is generated via bremsstrahlung. Attention is paid to the role of the
transversal and longitudinal focussing of the laser field, along with the
incorporation of a Gaussian pulse envelope. We compare our corresponding
results with predictions from plane-wave models and determine the parameters of
focused laser pulses which maximize the pair yield at fixed pulse energy.
Besides, the impact of various super-Gaussian profiles for the laser pulse
envelope and its transverse shape is discussed.
