Phase-dependent inversionless gain in a four-level atomic system with a closed interaction loop |
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| Authors: | Xu Wei-Hu Wu Jin-Hui Gao Jin-Yue |
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| Affiliation: | College of Physics, Shenzhen University, Shenzhen 518060, China;College of Physics, Jilin University, Changchun 130023, China; Key Laboratory for Coherent Light, Atomic and Molecular Spectroscopy of Ministry of Education, Jilin University, Changchun 130023, China |
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| Abstract: | A four-level atomic system with a closed interaction loop connectedby two coherent driving fields and a microwave field isinvestigated. The results show that inversionless gain can beachieved on a higher frequency transition outside the closedinteraction loop, and the gain behaviour can be modulated by thephase of the closed loop as well as the amplitude of the microwavefield. The phase sensitivity property in such a scheme is similar tothat in an analogous configuration with spontaneously generatedcoherence, but it is beyond the rigorous condition ofnear-degenerate levels with non-orthogonal dipole moments.Therefore this scheme is much more convenient in experimentalrealization. |
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| Keywords: | inversionless gain microwave field closed interaction loop phase |
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