Acousto-optics by Adrian Korpel

By Adrian Korpel

Revised and up to date, this moment version first explains heuristically the physics of acousto-optics prior to proposing the maths of the formal idea. the fabric is built-in to demonstrate and advertise the advance of recent principles, techniques, theories, innovations and units. The textual content additionally deals sections at the Near-Bragg regime and curved sound wave fronts, insurance of the numerical strategy, chosen functions, insurance of anisotropic Bragg diffraction, and fabric on spectral formalisms.

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Later, signal processingusing optical heterodyning was demonstrated independentlyby King and co-workers[52] and by Whitman, Korpel, and Lotsoff [53,54]. Since then, interest in this particular application has increased exponentially; extensive tutorialheview articles and references may be found in [55-571. Theyderived the now well-known result that the number of achievable resolvable angles was equal to the productof frequency swing and transit time of the sound through the light beam. , nonrandom) scanning, Foster later demonstrated that this number could be increased by about afactor of 10through theuse ofa traveling wave lens [59].

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). 25. Kogelnik, Bell Syst. Tech.

The first published description of a light modulator thisauthor is aware of was given by Lieben in 1962 [44]. Parallel processing for display purposes was pioneered by Ocolicsanyi [46] and used in the Scophony large-screen TV system of 1939 [46,47]. A modern version of the latter was demonstrated in 1966 by Korpel and co-workers [48], first in red and black using a He-Ne laser and later in color [49] with the help ofa Krypton laser. In orderto increase the bandwidthof the sound cell in these experiments (limited by virtue of the fact that long efficient interaction lengths decrease the tolerance about the Bragg angle, as already pointed out by Debye and Sears [4]), a device now called a beam-steering deflector [48,50] had to be invented.

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