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Background-free third-order harmonic generation induced by dynamic gratings in dual filaments

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Abstract

Background-free third-order harmonic generation is observed from dynamic gratings induced by dual laser filaments in argon gas. The filaments were generated by focusing two intense 60fs laser pulses noncollinearly into a gas cell. The optimal result is achieved with gas pressure of 2atm and zero relative delay. It seems that the off-axis third-harmonic generation is mainly due to the interaction between the two interfering fundamental pulses and their filaments.

© 2009 Optical Society of America

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