Abstract

It is argued from a physical point of view that the criteria for acousto-optic Bragg diffraction (characterized by only two orders of light being present) must ultimately include the strength of the sound field. This follows because the scattering effect that is due to the sidelobes of a rectangular transducer, although negligible at low power levels where the Bragg criterion is indeed sound-level independent, becomes of increasing importance at high power levels and causes additional orders to be generated. In this paper we demonstrate this numerically by reduction of the sidelobes through Hamming apodization of the sound field. The results clearly demonstrate a significant reduction in the light powers of the spurious orders, thereby extending Bragg operation to higher sound intensities than normally feasible.

© 1986 Optical Society of America

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