Abstract
Weak acousto-optical interaction provided, light diffraction tomography has proved to be a useful tool for mapping ultrasonic fields. Beyond this range, data acquisition and evaluation is far more difficult, which is mainly due to the fact that, in this case, the light intensity is no longer a function of only one variable but of two. Furthermore, the measurement of the acoustic phase is affected by additional optical phase shifts. A method has been developed which facilitates the quantitative mapping of ultrasonic fields in the intermediate range between weak and strong acousto-optical interaction. In terms of the ultrasonic frequency and the light sound interaction length, the measurement range could be extended by more than one order of magnitude. As a result, the favourable properties of light diffraction tomography, e.g. data acquisition without retroaction and with high spatial resolution, can be utilized for sound field investigations which have not been possible so far.
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