  We investigate light propagation in the gravitational field of multiple
gravitational lenses. Assuming these lenses are sufficiently spaced to prevent
interaction, we consider a linear alignment for the transmitter, lenses, and
receiver. Remarkably, in this axially-symmetric configuration, we can solve the
relevant diffraction integrals -- result that offers valuable analytical
insights. We show that the point-spread function (PSF) is affected by the
number of lenses in the system. Even a single lens is useful for transmission
either it is used as a part of the transmitter or it acts on the receiver's
side. We show that power transmission via a pair of lenses benefits from light
amplification on both ends of the link. The second lens plays an important role
by focusing the signal to a much tighter spot; but in practical lensing
scenarios, that lens changes the structure of the PSF on scales much smaller
than the telescope, so that additional gain due to the presence of the second
lens is independent of its properties and is govern solely by the transmission
geometry. While evaluating the signal-to-noise ratio (SNR) in various
transmitting scenarios, we see that a single-lens transmission performs on par
with a pair of lenses. The fact that the second lens amplifies the brightness
of the first one, creates a challenging background for signal reception.
Nevertheless, in all the cases considered here, we have found
practically-relevant SNR values. As a result, we were able to demonstrate the
feasibility of establishing interstellar power transmission links relying on
gravitational lensing - a finding with profound implications for applications
targeting interstellar power transmission.
