grabbe's example...

      An Example of Bohm's "Implicate Order"

                Crockett L. Grabbe

An excellent example of the implicate order can be seen in
a phenomenon known as the "plasma wave echo." The experiment
proceeds as follows. An external source antenna is placed in
a plasma (ionized gas) and a large electric field pulse is
imposed. The pulse creates a plasma wave oscillation that
rapidly damps away. A short time t later another pulse is
applied, creating another wave oscillation that damps away.
Immediately after this damping the plasma is back to a normal
unperturbed state. There is no measurement technique presently
available that could detect any residual disturbance of the
plasma. However, phase information on the two pulses is
contained in the microscopic velocity distribution of the
particles. This information is a property of the whole plasma
and is truly an enfolded order. At a time 2t this information
becomes unfolded as the plasma generates its own pulse from
the phase information contained within it. This pulse is the
plasma's echo to the first two external pulses.
  A review of echos similar to this is given in Roy W. Gould,
"Cyclotron Echo Phenomena," American Journal of Physics 37
(1969): 585-97.