Programme

P.36 -- Poster, VCTP-46

Date: Tuesday, 5 October 2021

Time: 08:30 - 10:00

Taget-dependent of high-order harmonic generation from atoms in chirp laser pulse

Thanh-Tu Nguyen (1), Cam-Tu Le (2), Ngoc-Loan Phan (1)

(1) Ho Chi Minh City University of Education, (2) Ton Duc Thang University

The interaction of an intense ultrashort laser pulse with atoms or molecules produces various nonlinear phenomena, among these, the high-order harmonic generation (HHG) has been extensively studied in past decades [1]. Using a chirp laser pulse instead of a common periodical one is an effective way to extend the plateau of HHG spectra [2]. In this report, we theoretically study the response of various atomic targets interacting with a chirp laser pulse. The HHG is simulated by solving the time-dependent Schrödiner equation (TDSE). We show that the HHG spectra contain multi plateaus with different cutoffs as indicated in Refs. [3]. More interestingly, this multi-plateau structure strongly depends on the atomic target. To better understand the physical origin of HHG enhancement, we perform semiclassical stimulations of electrons. [1] M. Lewenstein, P. Balcou, M. Y. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A, vol. 49, no. 3, pp. 2117–2132, 1994. [2] J. J. Carrera and S. Chu, “Extension of high-order harmonic generation cutoff via coherent control of intense few-cycle chirped laser pulses,” Phys. Rev. A, vol. 75, no. 3, p. 033807, 2007. [3] W. Jie, Z. Zhen, and L. Xue-Shen, “Extension of high-order harmonics and generation of an isolated attosecond pulse in the chirped laser field,” Chinese Phys. B, vol. 19, no. 9, p. 093201, 2010.

Presenter: Nguyen Thanh Tu