  The mechanism by which gamma-ray pulsars shine might be reproducible in a
laboratory. This claim is supported by three observations: (i) properly
focusing a few PW optical laser gives an electromagnetic field in the so-called
Aristotelian regime, when a test electron is radiation-overdamped; (ii) the
Goldreich-Julian number density of this electromagnetic field (the number
density of elementary charges needed for a nearly full conversion of optical
power into gamma-rays) is of order the electron number density in a solid;
(iii) above about $50$PW, the external source of electrons is not needed --
charges will be created by a pair production avalanche.

High Energy Astrophysical Phenomena