Abstract
Energy redistribution between two subpicosecond laser pulses of 2.5 eV photon energy is observed and studied in congruent, nominally undoped LiNbO3, aiming to reveal the underlying coupling mechanisms. The dependences of pulse amplification on intensity, frequency detuning and pulse duration point to two different contributions of coupling, both based on self-diffraction from a recorded dynamic grating. The first one is caused by a difference in pulse intensities (transient energy transfer) while the second one originates from a difference in pulse frequencies. The latter appears when chirped pulses are mutually delayed in time. A quite high coupling efficiency has been observed in a 280 µm thin crystal: one order of magnitude energy amplification of a weak pulse and nearly 10% net energy enhancement of one pulse for the case of equal input intensities.
Highlights
The intensity coupling of two light waves that propagate in a nonlinear medium is one of the basic phenomena of dynamic holography [1]
This type of coupling has attracted the interest of researchers since the discovery in 1980’s of unidirectional intensity transfer between two waves that are recording a shifted phase grating in a nonlinear optical crystal
The experimental study of the dynamic grating assisted energy transfer between two subpicosecond pulses reveals that this process can be quite efficient in LiNbO3
Summary
The intensity coupling of two light waves that propagate in a nonlinear medium (two-beam coupling) is one of the basic phenomena of dynamic holography [1]. This type of coupling has attracted the interest of researchers since the discovery in 1980’s of unidirectional intensity transfer between two waves that are recording a shifted phase grating in a nonlinear optical crystal (see, e.g., [2, 3]). The term "two-beam coupling" was still used to define the interaction of pulses (see, e.g., [5,6,7]), but it became often replaced by "pulse energy transfer" [8,9,10,11,12] or "energy exchange" [13]. More than a hundred original publications that consider different aspects of grating-assisted interaction of pulses have been published
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