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Schematic of experimental system with the component labels given as follows: EML1 and EML2, electroabsorption modulated generation and detection lasers, respectively; EDFA1 and EDFA2, erbium doped fiber amplifiers; CL, collimating lens; GSM, gimbal scanning mirror; and LPF, low pass filter.
The measured in-phase and quadrature components of displacement as a function of source-to-receiver distance at a generation frequency of 1.0 GHz. The inset shows the magnitude of the Fourier transform of the spatial scan with the sharp peak corresponding to the SAW.
Experimental and theoretical dispersion curves for two Al films of thickness on Si substrates. The best-fit Young’s modulus is also shown.
Time domain signal on a Al plate with a source-to-receiver distance of obtained through a discrete inverse Fourier transform of frequency domain data measured from 100 MHz to 1.0 GHz. The following arrivals are noted: SSL, surface-skimming-longitudinal wave; SAW, surface acoustic wave; L, longitudinal wave; SL, mode-converted SL wave; and S, shear wave.
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