Abstract
The concept of squeezing in quantum optics is applied to focused acoustic beam evaluation for the first time. Mathematical equivalence between coherent and squeezed states in quantum optics and angular spectra in various acoustical imaging schemes is derived and discussed. The squeezing operation, which deforms or controls pairs of physical quantities, is defined to evaluate focused acoustic beam quality from a unified point of view, especially in the measurement of anisotropic materials. Furthermore, the concept of the “vector figure of merit” is introduced, which describes both the resolution of focusing and the ability to measure the anisotropy of materials.
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