Absorption spectra and enhanced Kerr nonlinearity in a four-level system
Hao-Jie Huangfu(皇甫浩杰), Ying-Jie Du(杜英杰), and Ai-Hua Gao(高爱华)
Chin. Phys. B . 2023, (11): 114214 -114214 .  DOI: 10.1088/1674-1056/ad0622