Near-resonance self-action in amplitude- and frequency-modulated laser beams

This paper focuses to the beams initially modulated in frequency. How the saturation of absorption and refraction affects the transmission of modulation from phase at the input to the intensity at the output is studied. Frequency of modulation is taken low enough to consider the saturation as adiabatically following the field variation in time. The most prominent manifestations of the induced lens can be seen in moderate saturation regime. In this regime, the modulation frequency is varied to indicate transient effects. The modulation phase shift and amplitude is observed to decrease due to the inertia of the medium response. The examples considered demonstrate the efficiency and stability of the numerical model proposed.