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Parametric downconversion via cascaded optical nonlinearities in an aperiodically poled superlattice
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic diagram shows an APOSL composed of building block , modulated by the sequence function. The arrows indicate the directions of spontaneous polarization in ferroelectric materials. (b) Schematic diagram of the cascaded process in an APOSL. The APOSL has two predesigned reciprocal vectors and which are used to compensate for the phase mismatching in the OPG and the DFM processes, respectively. Thus, two QPM conditions are achieved simultaneously.

Image of FIG. 2.
FIG. 2.

Fourier spectrum of the sequence function [Eq. (1)].

Image of FIG. 3.
FIG. 3.

Signal spectrum observed at room temperature.

Image of FIG. 4.
FIG. 4.

(a) Simulation result Eq. (2) in a long APOSL. Dotted curve for signal beam in the APOSL. Solid curve for idler beam in the APOSL. Dashed curve for frequency difference beam in the APOSL. Dashed-dotted curve for idler beam in the POSL. (b) Output energy of idler beam under different input energy in an APOSL.

Image of FIG. 5.
FIG. 5.

Simulation of wave propagation with in congruent . (a) THz wave propagation in a POSL. denotes nonlinear gain of THz wave from the DFM process and denotes the propagation length. , , and . (b) THz wave propagation in an APOSL. , , , and . In the simulation, the refractive index for THz beam is about 5.2 (see Ref. 12). The incident energy is /pulse. The pulse width is , repetition rate is , and the beam radius is .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Parametric downconversion via cascaded optical nonlinearities in an aperiodically poled MgO:LiNbO3 superlattice