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.

理论上研究了使用复合受激拉曼绝热通道（CSTIRAP）技术与两个X射线激光脉冲相互作用的三能级Λ形核中的核态种群转移。由于现有X射线激光的频率小于伽马射线的频率，因此在此方法中，原子核被加速并与两个具有不同频率的X射线激光脉冲相互作用。我们使用一系列成对的延迟脉冲，以使每一级中的脉冲相位彼此不同。在这种方法中，调整泵浦激光和斯托克斯激光脉冲的最大值，以使与两个脉冲相对应的拉比频率在时间演化过程中相等。我们表明，通过正确选择每个阶段的相位以及脉冲顺序，在单光子和双光子共振的情况下，总体从初始基态完全转移到最终基态。在此方案中，步骤数是可选的，并且随着步骤数的增加，每个步骤中所需的激光强度会大大降低。