4.6 Article

Experimental determination of the interatomic potential in LiNbO3 via ultrafast lattice control

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APPLIED PHYSICS LETTERS
卷 110, 期 16, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.4980112

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  1. Department of Chemistry and Biochemistry at Brigham Young University

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We present a direct comparison between resonant terahertz (THz) and nonresonant impulsive stimulated Raman scattering (ISRS) excitation of phonon-polaritons in ferroelectric lithium niobate. THz excitation offers advantages of selectively driving only the forward propagating phonon-polariton mode to exceedingly high amplitudes, without complications due to nonlinear processes at the high 800nm pump fluences used in Raman excitation. At peak-to-peak THz electric field strengths exceeding 1MV/cm, the ferroelectric lattice is driven into the anharmonic regime, allowing experimental determination of the shape of the potential energy surface along this vibrational coordinate. Published by AIP Publishing.

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