Reciprocity breaking during nonlinear propagation of adapted beams   through random media
  Adaptive optics (AO) systems rely on the principle of reciprocity, or symmetry with respect to the interchange of point sources and receivers. These systems use the light received from a low power emitter on or near a target to compensate profile aberrations acquired by a laser beam during linear propagation through random media. If, however, the laser beam propagates nonlinearly, reciprocity is broken, potentially undermining AO correction. Here we examine the consequences of this breakdown. While discussed for general random and nonlinear media, we consider specific examples of Kerr-nonlinear, turbulent atmosphere. 
J.P. Palastro, J. Penano, W. Nelson, G. DiComo, L.A. Johnson, M.H.   Helle, and B. Hafizi
physics.optics