物理学报Issue(16)：1-6,6.DOI:10.7498/aps.62.164207
四能级双V型原子系统中考虑自发辐射相干的无粒子数反转激光*
Lasing without inversion with considering spontaneously generated coherence*
摘要
Abstract
We provide a four-level double-V type atomic system driven by two week probe fields and two strong coupling laser beams. In the condition of resonant four-wave mixing, the two probe fields can be amplified without population inversion. Due to the fact that the two excited states are close-lying upper levels of hyperfine structure, the spontaneously generated coherence (SGC) effect must be considered. Interestingly, the amplitude of gain is sufficiently enhanced with the same parameters as those in the case without considering SGC. In addition, we find that the probe gain is sensitive to the phase of two laser fields which interact with the same lower level. To be more specific, the amplitude of gain is modulated by the phase periodically but restricted byθ(the angle between two induced dipole moments). At the same time, we also analyze the influence of the coherence pumping (strong coupling fields) detuning.关键词
无粒子数反转激光/四波混频/自发辐射相干Key words
lasing without inversion/four-wave mixing/spontaneously generated coherence引用本文复制引用
张冰,刘志学,徐万超..四能级双V型原子系统中考虑自发辐射相干的无粒子数反转激光*[J].物理学报,2013,(16):1-6,6.基金项目
黑龙江省自然科学基金(批准号:F200928)资助的课题 （批准号:F200928）
