When the light-matter coupling strength is increased to g c = 0.05 a.u., the results are plotted with open circles in Fig. . First, the transition process of the system from the |E 2 ⟩ state to the |E 1 ⟩ state slows down (Fig. ) due to the decrease of the NAC between the |E 2 ⟩ and |E 1 ⟩ states (Fig. ). The decay process of the system to the |E 0 ⟩ is also postponed, see Fig. . Second, the population of |g1⟩ state is largely increased due to the increase of the light-matter coupling strength, as shown in Fig. .