基于周期极化掺镁铌酸锂晶体的六角可调相位阵列光栅

Hexagonal Tunable Phase Array Grating on Periodically Poled Mg-Doped LiNbO_3 Crystal

研究了基于周期极化掺镁铌酸锂(PPMg…LN)晶体的二维六角可调相位光栅及其Talbot效应光衍射成像。理论模拟不同相位差及分数Talbot距离条件下的近场光衍射强度分布,计算取样区内衍射强度随相位差和分数Talbot距离的变化,给出相位差恒定及变化情况下取样区强度最大值的位置。在理论研究基础上,设计与制备PPMg…LN六角可调相位阵列光栅,并进行了Talbot衍射成像的实验研究,实验结果与理论研究吻合较好。

Research of the tunable two-dimensional hexagonal phase array grating based on periodically poled Mg- doped LiNb03 （PPMg~ LN） crystal and its Talbot effect of light diffracton imaging is presented. Theoretical simulation is executed to study the intensity distribution of near-field optical diffraction under various phase differences and fractional Talbot distances. Average intensity of the sample area in diffraction field is simultaneously calculated with phase difference and fractional Talbot distance, so the position of the maximum intensity of the sampling area is located as the phase difference is constant or changing. On the basis of theoretical research, the tunable hexagonal phase array grating is designed and fabricated based on periodically poled Mg-doped LiNbO3 crystal. The Talbot diffraction imaging is successfully obtained, and the experimental results agree with the theoretical results well.