摘要
研究了在非旋波耦合条件下微波场建立的原子相干对光学双稳与多稳的控制.通过改变微波场的初始相位,可以有效地控制双稳与多稳的存在与否、迟滞环宽度和阈值强度的高低.旋波和非旋波耦合在物理上可视为双色激发,耦合的能级分裂成无穷多个子能级,原来的裸态跃迁变成无穷多个不同频率的跃迁.这些跃迁的相干叠加决定了介质的非线性吸收与色散,相干叠加的结果取决于微波场的相位.
We show the control of optical bistability and muhistability via the atomic coherence induced by the microwave field in the presence of the antirotating wave coupling. Appearance or disappearance of bistability and multistability, manipulation of the hysteresis hoop widths and the threshold intensity are achieved by changing the initial phase of the microwave field. Physically, the rotating wave and antirotating wave couplings can be treated as the equivalent bichromatic excitation. Each of the coupled levels are split into an infinite set of sublevels. As a consequence, each of the bare state transitions is split into an infinite set of transitions of different frequencies. The coherent superposition of these split transitions, which depends on the initial phase of the microwave field, determines the nonlinear absorption and dispersion of the medium.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期2236-2241,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10574052)资助的课题~~
关键词
原子相干
非旋波耦合
光学双稳与多稳
相位控制
atomic coherence, antirotating wave coupling, optical bistability and multistability, phase control
