Quantum Control Of The Optical Phenomena In Nonlinear Media

In the past decades, a great deal of attention has been paid to observing and understanding the quantum optical phenomena based on quantum coherent and interference in nonlinear media, due to their potential applications in many subjects and places. It is has been discovered many famous quantum optical phenomena such as Coherent Population Trapping, Electromagnetically Induced Transparency, Lasing Without Inversion, Optical Bistability/Multistability, Multi-Wave Mixing, and so on. The further works are carried out to study such optical phenomena that may be helpful to the developments of correlative subjects and places such as laser physics, nonlinear optics, atomic and molecular physics, high-speed optical communication, optical information disposal, all-optical switching, quantum information sciences, etc.In this thesis we have mainly studied optical features and its correlative phenomena in nonlinear optical media using semi-classical theory. The main work of the paper is given as following:(1) We theoretically investigate the hybrid absorptive-dispersive optical bistability and multistability in a four-level inverted-Y quantum well system inside a unidirectional ring cavity. We find that the coupling field, the pumping field as well as the cycling field can affect the optical bistability and multistability dramatically, which can be used to manipulate efficiently the threshold intensity and the hysteresis loop. The effects of the relative phase and the electronic cooperation parameter on the OB and OM are also studied.(2) We investigated the optical bistability in an Er³⁺-doped YAG crystal inside a unidirectional ring cavity. We find that the intensity and the frequency detuning of the coherent field as well as the rate of incoherent field can affect the optical bistability dramatically, which can be used to manipulate efficiently the threshold intensity and the hysteresis loop. The effect of the cooperation parameter on the OB is also studied.(3) Taking the phase of the applied fields into consideration, we investigate the transient gain-absorption property of a weak probe field in a three-level semiconductor quantum well system. It is found that the phase of the applied fields plays an important role in realizing the large gain of the probe field.(4) In a three-level asymmetric semiconductor quantum well system, owing to the effects that result from the incoherent pumping fields, the probe absorption of probe field can be effectively controlled. The result is achieved by applying the two incoherent pumping fields, so it is different from the conventional way in ordinary laser-driven schemes that coherent driving fields are necessary to control the probe absorption.(5) We have proposed a five-level∧-configuration Four-Wave Mixing(FWM) scheme based on the Two-Electromagenetically-Induced-Transparency (Two-EIT). The results show that the relative intensity of the generated FWM signal be controlled by adjusting the EIT window. The conversion efficiency of the FWM can also be controlled by adjusting the external coherent driving field, and the maximum FWM efficiency is nearly 30%.