within the sbs phase conjugator 46 in the present invention the beams are then recombined into a single phase conjugator 46 and routed in a brillouin enhanced four wave mixing optical loop as shown in fig2 a c as shown in fig2 b the reference beam 100 is made to pass through the cell 3 times with its third pass focus overlapping the focus point of the first pass beam all beams including the reference overlap in a first and second focus until the sbs process reaches threshold the beams transmit through the cell with the reference beam exiting after three focus passes as shown in fig2 b and the other beams 102 exiting to a beam block 110 after 2 focus passes fig2 c once the sbs begins to function as a phase locking mirror all beams are reflected phase locked in phase to each other back along their input path referring again to fig1 after reflecting from sbs phase conjugator 46 each beam retraces its path and is reflected by polarizing beamsplitter 48 out of the system as a spatially coherent phase locked output beam 50 from fig2 a c it is seen that the beams enter the conjugator horizontally propagate over the top of the second pass hr mirror beam block mirror propagate through one of a pair of confocal.