Abstract
Taking advantage of the short pulse duration and the high repetition rate of the fs pulse train, amplification without inversion (AWI) can be achieved in two- or three-level atomic systems. A modulation method using a static magnetic field to control such AWI gain in an atomic system is proposed. The schematic model of the 52S1/2−52P1/2 transition of 87Rb is adopted, and the results show that the system gain can be significantly enhanced and modulated by the magnetic field, while the population inversion can be almost completely suppressed. Moreover, the pulse number, pulse repetition period, and pulse area can also be utilized to modulate the AWI gain.
Highlights
Amplification without inversion (AWI) is the optical amplification that can be achieved with a smaller population in the upper level than the lower one, which is considered to be counter-intuitive to the traditional laser theory [1,2]
We propose an AWI system induced by the fs pulse train in the presence of a static magnetic field
The optical properties of the atomic system can be controlled by changing the magnetic field strength
Summary
Amplification without inversion (AWI) is the optical amplification that can be achieved with a smaller population in the upper level than the lower one, which is considered to be counter-intuitive to the traditional laser theory [1,2]. Influence of Magnetic Field on Amplification without Inversion Induced by a Femtosecond Pulse Train.
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