  Motivated by the fact that the null-shell of a collapsing black hole can be
described by a perfectly reflecting accelerating mirror, we investigate an
extension of this model to mirror semi-transparency and derive a general
expression for the corresponding Bogoliubov coefficients. In so doing, we
introduce the concept of "impulsive accelerated mirrors", corresponding to
those mirrors that are accelerated via an impulsive force. We show this
treatment guarantees analytic solutions of Bogolubov coefficients for generic
trajectories. In particular, we evaluate the corresponding particle production
from the so-obtained Bogoliubov coefficients. Finally, we recognize the mirror
as a Gaussian quantum channel acting between the spacetime regions of left-past
and right-future. As a consequence we study the loss/amplification properties
of this quantum channel, alongside the noise it creates, through which we
evaluate its capacities in transmitting classical and quantum information.
