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We consider a large class of optical cavities and gain media with an off-axisexternal feedback which introduces a two-point nonlocality. This nonlocalitymoves the lasing threshold and opens large windows of control parameters whereweak light spots can be strongly amplified while the background radiationremains very low. Furthermore, transverse phase and group velocities of asignal can be independently tuned and this enables to steer it nonmechanically, to control its spatial chirping and to split it into twocounter-propagating ones.

Signal amplification and control in optical cavities with off-axis feedback