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Enhancement of lasing without inversion induced by spontaneously generated coherence in an open ladder-type system

Aiyun Li, Xijun Fan, Fan-ge Bu +2 more

Optoelectronics LettersNov 1, 20060 citations

Spontaneously Generated Coherence in an Open Four-level Atomic System

Fan Xi-jun

We put forward a model of an open quasi Λ-type four-level atomic system,and then investigate the effect of spontaneously generated coherence(SGC) on the gain of lasing without inversion from different respects by using the numerical calculation results of the system in the steady state.The study results show that,the switching from absorption to lasing without inversion(LWI) and the enhancement of the LWI gain can be realized by adjusting the strength of SGC;the variety of the two factors p1 to p2 which represent the SGC effect will produce remarkable different influence on the LWI gain.We also find that,the LWI gain is much larger in open system than that in the corresponding closed system;moreover,when the incoherent pump field is absent,the LWI gain can be obtained in the open system but cant in the closed system.We put forward a model of an open quasi Λ-type four-level atomic system,and then investigate the effect of spontaneously generated coherence(SGC) on the gain of lasing without inversion from different respects by using the numerical calculation results of the system in the steady state.The study results show that,the switching from absorption to lasing without inversion(LWI) and the enhancement of the LWI gain can be realized by adjusting the strength of SGC;the variety of the two factors p1 to p2 which represent the SGC effect will produce remarkable different influence on the LWI gain.We also find that,the LWI gain is much larger in open system than that in the corresponding closed system;moreover,when the incoherent pump field is absent,the LWI gain can be obtained in the open system but cant in the closed system.

Journal of Optoelectronics·laserJan 1, 20070 citations

Doppler-enhanced gain in an open ladder inversionless lasing system

N. Cui, Xiaoyong Fan, C. Liu +4 more

Journal of Modern OpticsDec 30, 20032 citations

Effect of spontaneously generated coherence on transient evolution of LWI gain in an open Ladder type system

Yanling Yang, Lei Wang, Liu Zhong-Bo +3 more

The effect of spontaneously generated coherence （SGC） on transient evolution of gain of lasing without inversion （LWI） and modulation roles of the injection rate ratio and exit rate on SGC-dependent gain in an open Ladder type three level system are studied by using the numerical solution of the density matrix motion equation of the system. It was shown that: variation of SGC strength will make the transient and final stationary gains having a considerable changing; when incoherent pumping presents, LWI gain increases with the ratio of injection rates and exit rate decreasing, however, when incoherent pumping is absent, the case is just the opposite; by choosing suitable values of SGC strength, the injection rate ratio and exit rate, we can obtain the largest transient and final stationary gain.The effect of spontaneously generated coherence （SGC） on transient evolution of gain of lasing without inversion （LWI） and modulation roles of the injection rate ratio and exit rate on SGC-dependent gain in an open Ladder type three level system are studied by using the numerical solution of the density matrix motion equation of the system. It was shown that: variation of SGC strength will make the transient and final stationary gains having a considerable changing; when incoherent pumping presents, LWI gain increases with the ratio of injection rates and exit rate decreasing, however, when incoherent pumping is absent, the case is just the opposite; by choosing suitable values of SGC strength, the injection rate ratio and exit rate, we can obtain the largest transient and final stationary gain.

Acta Physica SinicaJan 1, 20097 citations

Effects of spontaneously generally coherence on probe response in an open lambda type system

Tian, Shu-fen, Junpeng Fan +7 more

它在探查地的原子系统，获得和分散是的一种开的 lambda 类型被看那停止对变化敏感自发地通常连贯(SGC ) 。parameterp 的价值反映 SGC 效果是否存在并且 SGC 的尺寸效果。在某些条件下面， whenp=0.002 电磁地导致了透明性发生；whenp 鈮 ?.002，没有倒置，放射激光能被认识到；whenp=0.95，有零吸收的折射的高索引能被获得。CLC 数字 O432.1+2 文件代码 A 这个工作被山东省的自然科学基础支持(没有。Y2001A07 ）它在探查地的原子系统，获得和分散是的一种开的 lambda 类型被看那停止对变化敏感自发地通常连贯(SGC ) 。parameterp 的价值反映 SGC 效果是否存在并且 SGC 的尺寸效果。在某些条件下面， whenp=0.002 电磁地导致了透明性发生；whenp 鈮 ?.002，没有倒置，放射激光能被认识到；whenp=0.95，有零吸收的折射的高索引能被获得。CLC 数字 O432.1+2 文件代码 A 这个工作被山东省的自然科学基础支持(没有。Y2001A07 ）

Optoelectronics LettersJan 1, 20060 citations

Lasing without inversion and inversion without lasing in the same energy-level system

Zhenfei Luo, Zhizhan Xu

Physics Letters AOct 1, 19924 citations

Enhancement of lasing without inversion induced by spontaneously generated coherence in an open ladder-type system

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