Nonlinearity of spread function of the tunable collinear acousto-optical filter

A work of the collinear acousto-optical filters (AOF) with fast retuning and high efficiency of diffraction has specificity. In this case the transition process of forming of the diffractive wave E₁(r,t), and also enrichment of the spectral structure of the field E₁(r,t) influence on the spread function (SP) Ψ(t,Δλ). Enrichment of the spectral structure of the field E₁(r,t) is connected with the nonlinearity of process in the acousto-optical interaction (AOI). Distortion of the SP, caused by mentioned effects, is determined by modulating function of the steering command u(t) of the AOF. The purpose of this work is to investigate the distortion Ψ(t,Δλ) at any velocity of retuning of the AOF, power and form of the steering command u(t).