The system has a light source i.e. laser diode, for producing partially coherent light, where a light conductor i.e. glass fiber, an optic light conducting element (16) i.e. glass conical stump, and the light source are positioned in a proximal supply unit. An actuator (11) i.e. loudspeaker, is coupled with the conductor, the conducting element and/or the light source, where the actuator generates aperiodic, chaotic or stochastic perturbations. The actuator is controlled by an electronic circuit. A motor (27) with an unbalance element (29) is positioned in a housing (25) of the actuator.
