High-Order Nonlinear Diffraction Harmonics in Nonlinear Photonic Crystals

Chinese Journal of Lasers, Volume. 46, Issue 2, 0208001(2019)

Boqin Ma^* and Huangjia Li

Author Affiliations

Faculty of Science and Engineering, Communication University of China, Beijing 100024, China

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Figures & Tables(5)

$Distribution of reciprocal lattice vectors in reciprocal space of two-dimensional Sierpinski fractal superlattice$

Fig. 1. Distribution of reciprocal lattice vectors in reciprocal space of two-dimensional Sierpinski fractal superlattice

$Nonlinear diffraction harmonics in LiNbO3 nonlinear photonic crystal with two-dimensional Sierpinski fractal superlattice$

Fig. 2. Nonlinear diffraction harmonics in LiNbO3 nonlinear photonic crystal with two-dimensional Sierpinski fractal superlattice

Fig. 3. Conical angles of nonlinear cerenkov radiation under different fundamental wavelengths. (a) External; (b) internal

Fig. 4. Transportation route of direct fifth-order nonlinear cerenkov harmonic in LiNbO3 nonlinear photonic crystal

Method inRef.	Superlatticesructure	Crystaltype	Fundamentallaser intensity	Inputdirection	Nonlineardiffraction	Harmonic	Shape ofharmonic
[14]	Circularperiodic array	LiTaO₃	100 GW/cm²	z	Bragg	Second-	Conical
[16]	One-dimensionalperiodic	LiNbO₃	80 GW/cm²	z	Raman-Nathcerenkov	Second-Second-	SpotSpot
[22]	Two-dimensionalshort-range ordered	LiNbO₃	60 GW/cm²	z	cerenkov	(Cascaded)Third-	Conical
[24]	Two-dimensionalcircular periodic	LiTaO₃	60 GW/cm²	z	Raman-Nath	(Cascaded)Third-	Conical
[29]	Two-dimensionalhexagonally periodic	LiTaO₃waveguide	—	x	Quasi-phasematched cerenkov	Second-	Spot
[30]					cerenkov	Second-	Spot or arc
[33]	Radially poled	LiTaO₃	3.8 TW/cm²	z	cerenkov	(Cascaded) Second-and third-	Conical