Short pulses laser generated shock waves in air during the ablation of
ceramics have been monitored with acoustical techniques. We have foun
d that on a given laser fluence domain the ablation rate can be relate
d to the shock wave energy. This shock wave energy is measured both wi
th the laser beam deflection technique and a microphone. We demonstrat
e that it is possible, after a calibration procedure, to simply use a
microphone for a real time control of the ablation process.