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Optical bistability in a five-level cascade EIT medium: an analytical approach

2016; Optica Publishing Group; Volume: 33; Issue: 4 Linguagem: Inglês

10.1364/josab.33.000735

1520-8540

Dinh Xuan Khoa, Le Van Doai, Le Nguyen Mai Anh, Trung Le Canh, Phan Van Thuan, Nguyễn Tiến Dũng, Nguyen Huy Bang,

Random lasers and scattering media

We propose an optical bistability (OB) model consisting of a five-level cascade electromagnetically induced transparency (EIT) medium placed in a unidirectional ring cavity. An input-output intensity relationship for a weak probe light field is derived as a function of parameters of a strong coupling light and cooperation C. The OB behaviors of the system are investigated with variation of the parameters. It has been shown that the OB behaviors occur simultaneously in three EIT windows. Furthermore, switching thresholds and the hysteresis loop can be controlled by the parameters of the coupling light and/or a cooperation of atomic medium. Such controllable OB behaviors can find interesting applications in bistable photonic devices working at low light intensity and multiple frequencies.