Inversionless amplification in the three-level atoms with and without a hidden inversion in reservoir

作     者：Olga Kocharovskaya Yu. V. Rostovtsev A. Imamoglu 

作者机构：Institute of Applied Physics Russian Academy of Sciences 46 Ulyanov strasse 603300 Nizhny Novgorod Russia Department of Physics Texas A & M University College Station Texas 77843-4242 Department of Electrical and Computer Engineering University of California Santa Barbara California 93106 

出 版 物：《Physical Review A》 (Phys Rev A)

年 卷 期：1998年第58卷第1期

页      面：649-649页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

摘      要：We consider the problem of amplification without inversion in a three-level atomic system. When atoms are driven by a field reservoir and a low-frequency coherent field, amplification of a high-frequency probe field may occur even when there is no population inversion on any atomic transition. We prove that, depending on the ratio of the probe and coherent drive field frequencies, which we term the frequency up-conversion factor, this process may or may not require hidden inversion in the field reservoir. In the special case of a frequency up-conversion factor less than 2, we demonstrate that amplification is possible even if the field reservoir is in complete thermal equilibrium: this represents a new kind of coherent radiation source, distinct from both conventional lasers and lasers without inversion.