SYMBOLIC ANALYSIS OF NMR-LASER CHAOS

For the extended Bloch-type model of the NMR laser, a binary partition is determined directly from tangencies between forward and backward f oliations of the Poincare map. Both forward and backward foliations ar e well ordered according to their symbolic sequences as those of the H enon map with a positive Jacobian. Based on the symbolic dynamics of t he Henon map the admissibility condition for allowed sequences is deri ved and admissible periods are obtained, among which some were formall y regarded as forbidden. The allowed periodic orbits are numerically v erified. Allowed chaotic sequences are also constructed.