Chaos in coupled lasers with low-frequency modulation

The dynamics of the array consisting of two coupled solid-state lasers with frequency modulations was researched numerically. Array intensity’s chaotic behavior is predicted when the modulation frequency is low. The physical mechanism of the chaos is discussed here qualitatively. It was found that not only a harmonic resonance itself but also the duration of the harmonic resonance long enough is needed for the appearance of the chaos.