We demonstrate energy exchange between two filament-forming femtosecond laser beams in liquid methanol. Our results are consistent with those of previous works documenting coupling between filaments in air; in addition, we identify an unreported phenomenon in which the direction of energy exchange oscillates at increments in the relative pulse delay equal to an optical period (2.6 fs). Energy transfer from one filament to another may be used in remote sensing and spectroscopic applications utilizing femtosecond laser filaments in water and air.
© 2012 Optical Society of America
Original Manuscript: June 21, 2011
Revised Manuscript: September 2, 2011
Manuscript Accepted: September 12, 2011
Published: December 22, 2011
B. D. Strycker, M. Springer, C. Trendafilova, X. Hua, M. Zhi, A. A. Kolomenskii, H. Schroeder, J. Strohaber, H. A. Schuessler, G. W. Kattawar, and A. V. Sokolov, "Energy transfer between laser filaments in liquid methanol," Opt. Lett. 37, 16-18 (2012)