We study active BAW energy removal from high-power-consuming acousto-optic devices for infrared photonics by a piezoelectric transducer. The active absorber converts the ultrasonic wave into electrical signal, which is dissipated in an external circuit. It is analytically shown that under plane wave approximation BAW reflection from the transducer tends to zero at a certain choice of complex load. Theoretical calculations are confirmed by experiments. We designed and fabricated a custom laser Q-switch based on SiO2 with an active absorber of LiNbO3 with a corresponding matching circuit. The electrical load has active value of 50 Ohm, which is transformed by the matching circuit to the optimal complex value. Experimental measurements demonstrated that over 60 % of the BAW energy in the operating RF bandwidth of the Q-switch could be removed from the acousto-optic crystal into the electrical load.