Interconnected ring oscillators

Threshold and operation conditions of the interconnected photorefractive ri ng oscillators are investigated, using the grating action method. Three typ es of two connected oscillators are considered, the first one consisting of two transmission grating crystals, the second one of two reflection gratin g crystals, and the third one of one transmission and one reflection gratin g crystal. It is found that, under similar conditions, the transmission-tra nsmission ring possesses the lowest threshold and attains the highest refle ctivity of the three.