  We propose a new method for detecting high-frequency gravitational waves
(GWs) using high-energy pulsed lasers. Through the inverse Gertsenshtein
effect, the interaction between a GW and the laser beam results in the creation
of an electromagnetic signal. The latter can be detected using single-photon
counting techniques. We compute the minimal strain of a detectable GW which
only depends on the laser parameters. We find that a resonance occurs in this
process when the frequency of the GW is twice the frequency of the laser. With
this method, the frequency range $10^{13}-10^{19} $ Hz is explored
non-continuously for strains $h \gtrsim 10^{-20}$ for current laser systems and
can be extended to $h \gtrsim 10^{-26}$ with future generation facilities.
