Design method of two-dimensional quasiperiodic optical super lattice structure

Abstract

The invention discloses a design method of a two-dimensional quasiperiodic optical super lattice structure. The method comprises the steps that 1, the three non-linear processes are two frequency doubling processes of frequency down conversions and cascade connections; 2, the wave vector lost distribution volumes in the three non collinear processes in step 1 are used as three reciprocal lattice vectors in an inverted space of a two-dimensional quasi periodicity optical super lattice, the sizes of the three reciprocal lattice vectors are decided by a nonlinear process, the directions are optimized using the best Fourier coefficient of the structure; 3, three basis vectors in a two-dimensional positive space are obtained according to the orthogonality relation of the reciprocal lattice vectors obtained in step 2, the three basis vectors constitute three parallelograms, the three parallelograms are strewn throughout the positive space with quasiperiodic sequences, the vertex of the parallelogram is used as the center of a round domain of the two-dimensional quasiperiodic optical super lattice, and the two-dimensional quasiperiodic optical super lattice is obtained. Non-collinear multi-wavelength laser is achieved, complicated spectral device is not required, which provides more convenience for fields such as quantum optics.

Description

technical field [0001] The invention belongs to the design field of a two-dimensional quasi-periodic optical superlattice structure, in particular to a two-dimensional quasi-periodic optical superlattice structure capable of realizing cascaded second-order nonlinear processes and obtaining non-collinear, multi-wavelength lasers, in particular The two-dimensional quasi-periodic optical superlattice structure is based on superlattices such as lithium niobate and lithium tantalate as frequency conversion crystals. Background technique [0002] Cascaded second-order nonlinearity refers to the cascading of two second-order nonlinear processes, including optical parametric up-conversion cascaded up-conversion (such as frequency doubling, sum frequency, etc.), optical parametric down-conversion cascaded up-conversion, optical parametric down-conversion Cascade down-conversion and other forms have very broad application prospects in the fields of all-optical switches, femtosecond pu...

AI Technical Summary

Problems solved by technology

Among them, one-dimensional quasi-periodic, two-dimensional periodic, and two-dimensional quasi-periodic optical superlattices can realize cascaded second-order nonlinear processes, but one-dimensional quasi-periodic optical superlattices cannot realize non-collinear lasers, and two-dimensional periodic optical Due to the limitation of the degree of freedom, the superlattice cannot realize the frequency conversion of any wavelength

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