By Adrian Korpel
Revised and up-to-date, this moment variation first explains heuristically the physics of acousto-optics sooner than providing the maths of the formal conception. the cloth is built-in to demonstrate and advertise the advance of latest principles, ideas, theories, innovations and units. The textual content additionally deals sections at the Near-Bragg regime and curved sound wave fronts, assurance of the numerical procedure, chosen functions, assurance of anisotropic Bragg diffraction, and fabric on spectral formalisms.
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Additional info for Acousto-optics, 2nd Edition
Ina graphical form, this condition is best illustrated by the so-called wave vector diagram, already indicated by Debye-Sears , but more formally developed by Kroll . 6 shows such a diagram for upshifted interaction in two dimensions. 3) means that there exists a one-to-one correspondence between plane waves of sound and plane waves of light. Now, itiswellknown that eachfieldsatisfyingHelmholtz’s equation can be uniquely decomposed into plane waves (if we neglect evanescent waves for the moment): the angular plane-wave spectrum .
22) As schematically indicated in Fig. 21). In an actual experiment, each planewave is of necessity a beam of finite width. 21) is quite plausible as it is also the basic equation for light diffraction bya grating of period h . The sound fieldin our experiments acts essentially likethat, with the proviso that its nature isthat of a (sinusoidal) phase, ratherthan amplitude grating. This point is actually nontrivial and merits some discussion. ,aRonchiruling). Our sound wave generates many orders, in spite of its sinusoidal character, because it is a phase grating.
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