【摘要】：提出一種基于空間光調(diào)制的光束聚焦控制方法,利用液晶空間光調(diào)制器產(chǎn)生動態(tài)的二元菲涅耳透鏡相位結(jié)構(gòu),以實現(xiàn)對光束焦斑的軸向與橫向偏移的快速精確調(diào)節(jié)。采用面陣探測器檢測光斑大小與位置信息,結(jié)合反饋控制機制可實現(xiàn)對光束聚焦點三維位置的自動校準(zhǔn)及穩(wěn)定性控制。該方法在調(diào)節(jié)過程中不同偏移量之間不存在耦合影響,且橫向偏移調(diào)節(jié)對光傳輸距離不敏感。進(jìn)一步介紹了基于該方法搭建的光束聚焦實時反饋控制系統(tǒng)。實驗表明,光束焦斑的軸向校準(zhǔn)能做到精確快速的收斂。橫向偏移校準(zhǔn)方面,在較短焦距的情況下能做到單步收斂,而在較長焦距的情況下需要結(jié)合比例積分微分控制算法進(jìn)行調(diào)節(jié),如利用數(shù)據(jù)擬合對調(diào)節(jié)誤差進(jìn)行經(jīng)驗修正,也可做到單步收斂。
[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.
【作者單位】： 廣州大學(xué)物理與電子工程學(xué)院;
【基金】：國家自然科學(xué)基金(11204044,11404071) 廣東省自然科學(xué)基金(2014A030313523) 廣東省大學(xué)生創(chuàng)新訓(xùn)練項目(201611078076)
【分類號】：O439
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本文編號：2383737