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FIELD-FREE MOLECULAR ORIENTATION IN DISSIPATIVE MEDIA BY A COMBINATION OF FEMTOSECOND AND THz LASER PULSES

YONG LIU

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China

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JIAN LI

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China

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JIE YU

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China

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, and

SHU-LIN CONG

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, P. R. China

Corresponding author.

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https://doi.org/10.1142/S0219633613500065Cited by:2 (Source: Crossref)

Abstract

We present a theoretical scheme for achieving the field-free molecular orientation in dissipative media by a combination of femtosecond and THz laser pulses. Numerical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch model. The molecular orientation degree is sensitive to the carrier-envelope phase of the THz pulse and the delay time between the two pulses. The orientation and the rotational population of CO molecules in dissipative environment are computed at different pressures and temperatures. The influence of pure decoherence on the molecular orientation is also discussed.

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