Method of information productivity increasing for efficient acousto-optic processors of spectral type

If an acousto-optic processor of spectral type, for example, acousto-optic spectrum analyzer (AOSA) with space integration operates in a low-frequency range, the lowest frequencies of the spectrum to be analyzed (which can be related to the transition zone between Raman-Nath and Bragg diffraction modes) may produce higher orders of diffraction. This creates the frequency bandwidth limitation of one octave for such a device. The present paper is devoted to the method allowing to avoid this limitations. The method of data decoding using the inverse part of the device transmission function has been considered in details. The method includes introduction into the Bragg cell on a level with ordinary information signal, also additional signal of double frequencies and second additional signal with uniform frequency spectrum and high enough power. It has been shown that this method application compensates the second diffraction order and allows to increase significantly both the device frequency range and its information productivity. Keywords: information productivity, Bragg diffraction mode, high efficiency acousto-optic processors, information signal, dynamic range