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Abstract
A simple optical method is described for studying ultrasonic pulses as short as two or three cycles in duration in the low-megahertz frequency range. An incident collimated light beam having a width of one ultrasound wavelength is observed in the optical farfield of the ultrasonic grating midway between the maxima of the central and first diffraction orders. A close approximation to both the amplitude and phase of the acoustical pressure along the light path is obtained. The simplicity and reproducibility of this method warrants its consideration as a procedure for calibration and comparison of the transmit pulse characteristics of medical ultrasound systems. [Work supported by NINCDS Grant NS-06655 and a grant from North Carolina United Way.]
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