调频场作用下双光子电离光电子谱特性

Study on properties of the two-photon ionization photoelectron spectra by frequency-modulated fields

应用微扰理论和数值计算方法,研究了调频光场作用下激发与电离模型中双光子电离光电子谱的相干特性.分析了调频光场的调制振幅、调制频率以及初相位对双光子电离光电子谱的影响.结果表明,调制振幅、调制频率以及初相位对双光子电离光电子谱有调制作用.选取合适的参量,可以实现对双光子电离光电子谱的量子控制.这一相干量子控制的机理是强场作用下激发态的粒子在两个缀饰态之间的选择性布局所致.

Properties of the two-photon ionization photoelectron spectra in excitation-ionization scheme by frequency-modulated fields are studied by means of perturbation theory and numerical calculation methocL The influences on the photoelectron spectra by the modulated amplitude, the modulated frequency, and the initial phase of the frequency-modulated field and the detuning are discussed under strong-field mechanism. It is shown that the photoelectron spectra can be modulated by the modulated amplitude, the modulated frequency, the initial phase and the detuning. Quantum control of the photoelectron spectra can be realized by those parameters. Mechanism of quantum coherent control in this system is monitoring the selective population of dressed states （SPODS）.