Simultaneous Extension and Enhancement of the HHG Plateau by Using Combined Lasers Irradiating on a United Two-Atom System

Chin. Phys. Lett.

2005, Vol. 22

Issue (3): 580-583 DOI:

Original Articles

Simultaneous Extension and Enhancement of the HHG Plateau by Using Combined Lasers Irradiating on a United Two-Atom System

CHEN Ji-Gen;CHEN Gao;YANG Yu-Jun;CHI Fang-Ping;DU Wen-He;ZHU Hai-Yan;ZHU Qi-Ren

Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012

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CHEN Ji-Gen, CHEN Gao, YANG Yu-Jun et al 2005 Chin. Phys. Lett. 22 580-583

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Abstract We present the high-order harmonic generation spectrum from a united two-atom system simultaneously exposed to a fundamental Ti:sapphire and its 33rd harmonic (H33) lasers by numerically solving a one-dimensional time-dependent Schrödinger equation. At a suitable inter-nuclear separation, the harmonic plateau is widened from I_p+3.2U_p in the single-atom case up to I_p+5.6U_p in the united-atom case. Furthermore, the plateau is heightened in excess of six orders of magnitude by using the combined lasers compared with the case of the fundamental laser alone. Such a scheme can step by step accomplish the following processes: through a single H33 photon resonance transition an appropriate amount of electrons are first populated to an excited state, in which the electrons are easily ionized and subsequently accelerated by the fundamental laser; then they can recombine with the neighbouring atom, so that high-efficiency emissions of the harmonics beyond I_p+3.2U_p are successfully realized.

Keywords: 32.80.Rm 42.50.Hz 42.65.Ky

Published: 01 March 2005

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.50.Hz	(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2005/V22/I3/0580

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	CHEN Ji-Gen
	CHEN Gao
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	ZHU Hai-Yan
	ZHU Qi-Ren

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