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Abstract
Nuclear-state population transfer in three-level Λ-like nuclei that interact with two X-ray laser pulses using composite stimulated Raman adiabatic passage (CSTIRAP) technique is investigated theoretically. Due to the fact that the frequency of existing X-ray lasers is less than the frequency of gamma rays, so in this method the nuclei are accelerated and interact with two X-ray laser pulses with different frequencies. We use a series of pairs of delay pulses so that the phases of the pulses in each stage are different from the other one. In this method, the maximum values of the pump and Stokes laser pulses are adjusted so that the Rabi frequencies corresponding to the two pulses are equal during time evolution. We show that by properly selecting the phases as well as the order of the pulses in each stage, in single-photon and two-photon resonance cases, the population is completely transferred from the initial ground state to the final ground state. In this scheme, the number of steps is optional and as the number of steps increases, the required lasers intensities in each step decrease significantly.
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