Fig. 1. Experimental setup for Mach–Zehnder interferometer: PBS, polarized beam splitter; BS, beam splitter; LSCP, liquid suspended carbon particles; CCD, CCD camera.

Fig. 2. (a) Interferogram image of the laser acoustic wave at delay time 0.8 µs, (b) 2D FFT result, and (c) phase distortion as a false color image.

Fig. 3. Interferograms and phase distortions of interferograms at different time moments demonstrating the propagation of the longitudinal wave and the transverse wave (a), (e) at 0.4 µs, (b), (f) at 0.6 µs, (c), (g) at 0.8 µs, and (d), (h) at 1.0 µs.

Fig. 4. Simulation results of the laser acoustic wave propagation at various delay times: (a) at 0.4 µs, (b) at 0.6 µs, (c) at 0.8 µs, and (d) at 1.0 µs.