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利用傅里叶变换法在自散焦LiNbO3:Fe晶体中写入光子晶格的过程中发现,阵列光束与写入晶格相互作用产生的空间二次谐波对写入晶格的结构具有一定的影响。表现为光子晶格中空间频率的倍频现象,干涉条纹的分裂现象和布拉格带隙的展宽现象。通过对一维光子晶格中空间二次谐波的数值模拟和理论计算,证明了空间二次谐波的产生是晶格结构发生改变的主要原因。实验表明,通过控制空间二次谐波的产生情况可以有效地改变写入光子晶格的内部结构。
In the process of writing photonic lattice in self-defocusing LiNbO3: Fe crystal by Fourier transform method, it is found that the second harmonic generated by the interaction between the array beam and the writing lattice has a definite effect on the structure of the written lattice Impact. The phenomenon of frequency multiplication in the photonic crystal lattice space, the interference fringe splitting phenomenon and the Bragg band gap broadening phenomenon. The numerical simulation and theoretical calculation of the second harmonic in the one-dimensional photonic lattice prove that the generation of the second harmonic in space is the main reason for the change of the lattice structure. Experiments show that by controlling the second harmonic generation space can effectively change the internal structure of the written photonic lattice.