基于光场计算和图像处理算法的激光自动对焦方法

针对飞秒激光三维加工中如何定量寻找焦点位置问题,提出了一种新型的计算光场分布与图像处理算法相结合的自动对焦方法。首先,根据Richards-Wolf矢量衍射理论推导经过物镜后激光在多层介质内的激光光场分布函数,并利用数值模拟求解高斯光束在各个介质不同位置处的光场分布计算结果,进而在理论上得到激光光束直径在多层介质中不同位置的变化关系。其次,实验中由上到下在多层介质中每隔相同离焦距离采集一系列光斑图像,通过感兴趣区域(ROI)、最大类间差法(Otsu)、Canny边缘提取等图像处理算法处理后,获取实际多层介质中不同位置处激光光斑直径以及激光直径随位置的变化曲线。最后,将理论与实验作对比并进行曲线校正,获得了实际激光光斑在多层介质中的变化曲线,以此建立基于计算光场分布和图像处理算法为基础的激光加工自动对焦方法。

激光自动对焦中离焦量的探测与计算方法

根据激光光线聚焦状态不同对应被测面上激光光斑形状不同的特点,通过引入辅助激光束,分析了调焦CCD采集的激光光斑图像信息,进而根据光斑形状及半径等信息确定被测面对焦状态。针对实验中每隔相同离焦距离采集的一系列光斑图像,提出了相应的图像处理方案,以提取所需光斑半径信息,进而进行光斑半径与离焦量转换。实验结果表明,光斑半径与离焦量呈线性关系,最大线性范围灵敏度为2.342像素/μm,最高可实现0.43μm分辨率。

Side-on Ignition Compared with Ignition by Laser Driven Compression

Recent results for side-on ignition of uncompressed proton-boron （HB 11） fusion that use the Chu-Bobin side-on ignition with petawatt-picosecond laser pulses is extended to the reaction of helium 3-helium 3 （He3）. The HBll reaction resulted in radioactivity is lower values than from burning coal per generated energy. This was based on the very rare experiments with extreme suppression ofpre-pulses in order to suppress relativistic self-focusing. Subsequently, acceleration of highly directed plasma blocks of modest temperature and ultra-high ion current densities above 10H Amps/cm2 were measured in agreement with earlier derived theory. This permits the conditions of the Chu-Bobin for side-on ignition of solid density fusion. Results for similar neutron lean He3 are reported. A detailed comparison with the usual spherical laser compression and ignition of fusion is given for clarifying the basic differences of the ignition process.