Acousto-optical spectrum analyzer based on Bessel light beams

The features of non-collinear acousto-optical diffraction of quasi-diffraction Bessel light beams in uniaxial crystals for creating radio frequency signal spectro-analyzers are theoretically investigated. An expression is found for the diffraction efficiency depending on the parameters of interacting Bessel beams of $o$- and $e$-type, as well as on the values of the overlap integrals and the frequency detuning of the Bragg synchronism. It is shown that the frequency resolution of the acousto-optical spectrum analyzer is $\sim$ 3.5 kHz in the absence of accurate transverse phase synchronism of diffracted Bessel light beams.