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Superheterodyne detection of laser generated acoustic waves
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

Experimental and theoretical dispersion curves for two Al films of thickness on Si substrates. The best-fit Young’s modulus is also shown.

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superheterodyne detection of laser generated acoustic waves