The Study Of Lasing Without Inversion And Coherent Control Of Optical Properties In An Open V-Type System

The study of coherent control of optical properties and optical courses is one of the most important and active research front fields in international optics nowadays. The study of coherent control has not only an important theoretical value, but also wide application prospects in many fields, such as quantum optics, nonlinear optics, quantum information and photo-communication, etc. In addition, Atomic coherence effects have multiple potential applications in many aspects. Among numerous phenomena of atom coherence, lasing without inversion (LWI) has received tremendous attention. As a new method of producing laser, LWI can obtain laser light in spectral domains, e.g. the x-ray even γ-ray range, where conventional methods based on population inversion are not available or are difficult to implement, so LWI has wide application prospects. Based on the work of the former people, we studied the lasing without inversion and coherent control of optical properties in an open V-type system in this paper. This paper consists of five chapters. In Chapter 1, we explained the significance for studying coherent control and LWI, showed the basic principle of producing LWI, and introduced simply the current research state of coherent control and LWI. In Chapter 2, we studied the nonlinear dynamics of the open V system. By studying the destabilization of non-lasing solution of density matrix equations of motion, we found that in the resonant case the open V system can not only produce pulsed LWI putout through the destabilization induced by the Hopf bifurcation but also produce continuous LWI putout by the destabilization induced by the Pitchfork bifurcation. Moreover, we discussed the effect of the unsaturated gain coefficient, the cavity damping rate, ratio of the atomic injection rates and atomic exit rate on the area of destabilization that can lead to producing LWI. In addition, by using the numerical calculation results, the time evolution laws of the probe laser field and populations corresponding to two cases in producing inversionless lasing (i.e., through the...