深圳大学电子科学与枝术学院 The basic physical mechanism is an interplay between the oscillation field in the resonator and the atomic inversion an increase in the field intensity causes a reduction in the inversion due to the increased rate of stimulated transitions This causes a reduction in the gain which in turn tends to decrease the field intensity.深圳大学电子科学与技术学院 • The basic physical mechanism is an interplay between the oscillation field in the resonator and the atomic inversion. An increase in the field intensity causes a reduction in the inversion due to the increased rate of stimulated transitions. This causes a reduction in the gain which in turn tends to decrease the field intensity