OBSERVATION OF PERIOD-ADDING IN AN OPTOGALVANIC CIRCUIT

Period-adding is a novel devil's staircase structure that, however, is less observed in comparison with the other bifurcation structures, su ch as period-doubling and intermittency. We show that an optogalvanic system consisting of a neon bulb shone by a modulated green-light He-N e laser exhibits period-adding. This suggests an interesting class of nonlinear systems where period-adding is inherent.