Program

O.19 -- Oral, NCTP-42

Date: Wednesday, 2 August 2017

Time: 14h00 - 14h20

High-order harmonic generation from two-state hydrogen atom

Ngoc-Loan T. Phan, Thanh-Tuynh T. Nguyen, Van-Hung Hoang

Department of Physics, Ho Chi Minh City University of Pedagogy

High-order harmonic generation (HHG) emitted from hydrogen atom with coherent superposition of the ground and first excited states, exposed to an intense ultra-short laser pulse is systematically studied in this work. First, we discuss in detail how the contribution of initial population of excited state affect on the intensity of HHG spectra, and show that HHG conversion efficiency is extremely sensitive to the existence of the excited state. Second, we demonstrate the appearance of the multi-cutoff in HHG spectra when intense laser with long wavelength is used. Moreover, we claim that this multi-cutoff effect occur due to the depletion phenomenon and a clear explanation is also given.

Presenter: Phan Thi Ngoc Loan