基于单压电变形镜的散斑抑制研究  

Research on speckle suppression based on a single piezoelectric deformable mirror

作　　者：孙冲 俞历程 鲍凯业 马剑强[1] SUN Chong;YU Li-cheng;BAO Kai-ye;MA Jian-qiang(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《激光与红外》2024年第11期1688-1693,共6页Laser & Infrared

基　　金：浙江省基础公益研究计划项目(No.LGG22E050002);宁波市重大科技攻关项目(No.2021Z068);浙江省省属高校基本科研业务费专项资金项目(No.SJLY2020002)资助。

摘　　要：针对激光的高相干性产生的散斑严重影响成像质量的问题,提出了一种基于单压电变形镜的散斑抑制方法。搭建了基于61单元压电变形镜的测试系统,研究了面形复杂度、幅值、更新频率对成像散斑对比度的影响。当参与工作的致动器数目为61,面形更新频率为2.6kHz,波前面形RMS为1.8μm时,散斑对比度降低到4%以下,此时散斑被明显抑制。实验结果表明面形复杂度越高、更新频率越快、幅值越大,得到的图像的散斑对比度越小,获得的图像信息越好。Aiming at the problem that speckle caused by high coherence of laser seriously affects the imaging quality,a speckle suppression method based on a singlepiezoelectric deformable mirror is proposed in this paper.A test system based on a 61 element piezoelectric deformable mirror is constructed,and the effects of surface complexity,amplitude and update frequency on imaging speckle contrast are investigated.When the number of actuators involved in the work is 61,the updating frequency of surface shape is 2.6 kHz,and the RMS of wavefront shape is 1.8μm,the speckle contrast is reduced to to less than 4%,at which time the scattering is significantly suppressed.The experimental results show that the higher the surface complexity,the faster the update frequency,and the larger the amplitude,the smaller the speckle contrast of the obtained image and the better the image information.

关 键 词：自适应光学 压电变形镜 散斑叠加 散斑抑制 

分 类 号：TN249[电子电信—物理电子学] O438[机械工程—光学工程]