Experimental study on the characteristics of the frequency of acoustic wave induced by high power laser

In order to study the characteristics of the frequency of acoustic waves induced by high power laser, the acoustic waves were received by a wide band acoustic sensor. Then they were imported to MATLAB and calculated to obtain the power spectral density (PSD). After the analysis of the PSD of the acoustic waves induced by Nd:glass laser with water or K9 optical glass under different conditions as overlay,the frequencies at the maximum peak of the PSD were obtained. It is discovered that the frequencies are strongly influenced by different overlay or the overlay under different conditions, instead of the laser power density. The outcome provides important guiding significance to the realization of the on-line monitoring of the laser shock processing.