Possibility of phase conjugation (PC) of solid-state laser radiation via Brillouin Enhanced Four-Wave Mixing (BEFWM) has been shown experimentally. Correction of various types of optical aberration introduced into incoming signal has been observed. PC-fidelity has been estimated to be equal to 0.62. Principle of operation of a multifunctional telescope system using BEFWM effect for correction for priary mirror aberration is briefly described.