Abstract
The system of difference-differential equations for the amplitudes of a diffracted light-wave caused by two adjacent ultrasonic beams, a fundamental followed by its nth harmonic, is solved for values of ρ outside the Raman-Nath region, and simplified expressions are deduced for the intensities up to order n. Conclusions are drawn concerning the influence of the phase-shift δ on the diffraction spectrum, and the calculation of the factor α n from the intensities (α n represents the ratio of the ultrasonic pressures). All results are applied to the case of a fundamental and its third or fourth harmonic.
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