The time-resolving opto-acoustic fibre sensor for registration of acousto-optical signal parameters in devices with fibre-optic delivery systems of pulsed laser radiation and feedback system was investigated. The feedback system enabled the changes and checked the energy (power) of laser radiation with respect to characteristics of the acoustic wave that were laser-induced in the course of object destruction. It was shown that the opto-acoustic feedback systems defined energy of laser radiation passed through the fibre and also the frequency of laser-induced acoustic waves.