Abstract
The scenario of the transition from a stationary state to the regime of generation of optical dynamic chaos is studied, which appears in He-He laser with delayed feedback. The coefficient of feedback is proportional to the output laser power and the changes of the discharge current. Depending on the coefficient of the signal of feedback subharmonic we observed the cascade of bifurcations of doubling period, the inverse cascade, the cycles with period f/3 and f/5, and the regime of dynamic chaos whose spectrum has no resonance frequencies. The range of existence of the observed regimes depended greatly on the degree of nonlinearly of the watt- ampere energy characteristics, defined by the processes of saturation of inversion of population and the controlled pressure of gas in the active element. Optical chaos in such non-linear systems appears, when the delay is greater than the life times of the metastable states of helium and neon that determine the internal dynamics of the laser. These results can be used for creation of optical generators of amplitude and frequency noise and information security systems.
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