Acousto-optics by Adrian Korpel

By Adrian Korpel

Revised and up-to-date, this moment variation first explains heuristically the physics of acousto-optics prior to providing the maths of the formal concept. the cloth is built-in to demonstrate and advertise the improvement of latest rules, thoughts, theories, innovations and units. The textual content additionally bargains sections at the Near-Bragg regime and curved sound wave fronts, insurance of the numerical procedure, chosen purposes, insurance of anisotropic Bragg diffraction, and fabric on spectral formalisms.

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17. , Academiae Analecta, 48, 26 (1986). 18. Raman, C. , and Nath, N. S. , Proc. Indian Acad. , 2, 406 (1935). 19. Raman, C. , and Nath, N. S. , 2, 413 (1935). 20. Raman, C. , and Nath, N. S. , Proc. , 3, 75 (1936). 21. Raman, C. ,and Nath, N. S. , Proc Indian Acad. , 3, 119 (1936). 30 Chapter 2 22. Raman, C. , and Nath, N. S. , Proc. Indian Acad. , 3. 459 (1936). 23. Goodman, J. , Introduction to Fourier Optics, McGraw-Hill, New York (1968). 24. Rayleigh, J. W. , Theory ofsound, Vol. 11, Dover, New York(1945).

The latter case is dealt with in a rather complicated way in order to show that even and odd orders show even and odd harmonics of the sound frequency in their Doppler shift and to calculate their contribution. , compared to the light frequency) in time. Consequently, the results could have been derived directly from the previous case by substituting a time-varying accumulated phase shift in the place of a fixed one. In their fourth paper [21], Raman and Nath took as a starting point Helmholtz’s scalar equation with spatio/temporal variation of the propagation constant; their fifth paper [22] was similar but dealt with oblique incidence.

1 Normal Incidence Let Ei denote the complex electric field strength of the normally incident plane wavein Fig. , E(x, 0, t)=E(x, O)=Ei. 19) represents a spatially corrugated wavefront at the exit of the sound field. This is schematically indicatedby the wavy line in Fig. 2. 19) is strongly reminiscent of electronic phase modulation that, as most electrical engineers are well aware of, results in many sidebands, the amplitudes of which are given by Bessel functions [2]. 20) where the summation is fromn = - W to n = + q and J n denotes the nth order Bessel function.

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