https://doi.org/10.1140/epjd/e2017-80135-5
Regular Article
Quantum control of atomic two-photon ionization by ultrashort light pulse effect
1 United Microelectronics Corporation, Hsinchu 30078, Taiwan
2 Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan
3 Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
a
e-mail: hclee.phys@gmail.com
Received: 28 February 2017
Received in final form: 23 May 2017
Published online: 25 July 2017
We demonstrate that the two-photon photoelectron spectrum can be manipulated by an ultrashort light pulse. We decompose a short pulse into a linear superposition of Fourier modes. The two-photon transition amplitude becomes a summation of all pathways. The contribution of each pathway was accurately calculated by using a second-order variational method. By properly choosing the carrier frequency and pulse duration according to the calculated two-photon absorption factor versus the absorbed first photon energy, the photoelectron spectrum can become single- or double-peaked. We use the hydrogen atom as a model and study both cases of linearly and circularly polarized light pulse.
Key words: Nonlinear Dynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2017
