基于空间光调制的光束聚焦实时反馈控制方法及系统
发布时间：2018-12-17 05:34
【摘要】：提出一种基于空间光调制的光束聚焦控制方法,利用液晶空间光调制器产生动态的二元菲涅耳透镜相位结构,以实现对光束焦斑的轴向与横向偏移的快速精确调节。采用面阵探测器检测光斑大小与位置信息,结合反馈控制机制可实现对光束聚焦点三维位置的自动校准及稳定性控制。该方法在调节过程中不同偏移量之间不存在耦合影响,且横向偏移调节对光传输距离不敏感。进一步介绍了基于该方法搭建的光束聚焦实时反馈控制系统。实验表明,光束焦斑的轴向校准能做到精确快速的收敛。横向偏移校准方面,在较短焦距的情况下能做到单步收敛,而在较长焦距的情况下需要结合比例积分微分控制算法进行调节,如利用数据拟合对调节误差进行经验修正,也可做到单步收敛。
[Abstract]:In this paper, a method of beam focusing control based on spatial light modulation is proposed. The liquid crystal spatial light modulator is used to generate a dynamic two-phase Fresnel lens phase structure, which can adjust the axial and lateral shift of the beam focal spot accurately and quickly. The area array detector is used to detect the spot size and position information, and the feedback control mechanism can be used to realize the automatic calibration and stability control of the three dimensional position of the beam focus. The method has no coupling effect between different offsets and is not sensitive to optical transmission distance. Furthermore, the beam focusing real-time feedback control system based on this method is introduced. Experimental results show that the axial calibration of the focal spot of the beam can achieve accurate and rapid convergence. In the aspect of lateral offset calibration, one-step convergence can be achieved in the case of shorter focal length, while in the case of longer focal length, it needs to be adjusted with proportional integral-differential control algorithm, such as empirical correction of adjustment error by data fitting. One step convergence can also be achieved.
【作者单位】： 广州大学物理与电子工程学院;
【基金】：国家自然科学基金(11204044,11404071) 广东省自然科学基金(2014A030313523) 广东省大学生创新训练项目(201611078076)
【分类号】：O439
，
本文编号：2383737
[Abstract]:In this paper, a method of beam focusing control based on spatial light modulation is proposed. The liquid crystal spatial light modulator is used to generate a dynamic two-phase Fresnel lens phase structure, which can adjust the axial and lateral shift of the beam focal spot accurately and quickly. The area array detector is used to detect the spot size and position information, and the feedback control mechanism can be used to realize the automatic calibration and stability control of the three dimensional position of the beam focus. The method has no coupling effect between different offsets and is not sensitive to optical transmission distance. Furthermore, the beam focusing real-time feedback control system based on this method is introduced. Experimental results show that the axial calibration of the focal spot of the beam can achieve accurate and rapid convergence. In the aspect of lateral offset calibration, one-step convergence can be achieved in the case of shorter focal length, while in the case of longer focal length, it needs to be adjusted with proportional integral-differential control algorithm, such as empirical correction of adjustment error by data fitting. One step convergence can also be achieved.
【作者单位】： 广州大学物理与电子工程学院;
【基金】：国家自然科学基金(11204044,11404071) 广东省自然科学基金(2014A030313523) 广东省大学生创新训练项目(201611078076)
【分类号】：O439
，
本文编号：2383737
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