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Bootstrap beacon creation for overcoming the effects of beacon anisoplanatism in laser beam projection system.

机译：Bootstrap信标创建，用于克服激光束投影系统中信标各向异性的影响。

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摘要

The task of delivering a sufficient level of airborne laser energy to ground based targets is of high interest. To overcome the degradation in beam quality induced by atmospheric turbulence, it is necessary to measure and compensate for the phase distortions in the wavefront. Since, in general, there will not be a cooperative beacon present, an artificial laser beacon is used for this purpose. In many cases of practical interest, beacons created by scattering light from a surface in the scene are anisoplanatic, and as a result provide poor beam compensation results when conventional adaptive optics systems are used. In this work we present three approaches for beacon creation in a down-looking scenario. In the first approach we probe the whole volume of the atmosphere between transmitter and the target. In this case the beacon is created by scattering an initially focused beam from the surface of the target. The second approach uses an uncompensated Rayleigh beacon at some intermediate distance between the transmitter and the target. This method allows compensation for only part of the atmospheric path, which in some cases may provide sufficient performance. Lastly, we present a novel technique of "bootstrap" beacon generation that allows achieving dynamic wavefront compensation. In this approach a series of compensated beacons is created along the optical path gradually probing the atmospheric turbulence with compensated beacons at increasing distance from the aperture. The performance of these techniques is evaluated by using the average Strehl ratio and the radially averaged intensity of the beam falling on the target plane. Simulation results show that under most turbulence conditions of practical interest the bootstrap technique provides better compensation performance compare to the other two techniques. Power requirements for Rayleigh beacon generation was also investigated. It was found that a laser capable of generating on the order of 3 J of laser pulse energy per pulse is suitable for the laser projection system described in this work.
机译：向地面目标传送足够水平的机载激光能量的任务非常重要。为了克服由大气湍流引起的光束质量下降，有必要测量和补偿波前中的相位失真。由于通常将不存在协作信标，因此为此目的使用了人工激光信标。在许多实际感兴趣的情况下，通过从场景中的表面散射光创建的信标是等平面的，因此，当使用常规的自适应光学系统时，其光束补偿效果不佳。在这项工作中，我们提出了在俯视场景中创建信标的三种方法。在第一种方法中，我们探测变送器和目标之间的整个大气体积。在这种情况下，通过从目标表面散射最初聚焦的光束来创建信标。第二种方法在发射机和目标之间的某个中间距离处使用未补偿的瑞利信标。此方法仅允许补偿部分大气路径，在某些情况下可以提供足够的性能。最后，我们提出了一种“引导”信标生成的新技术，该技术可以实现动态波前补偿。在这种方法中，沿着光路创建了一系列补偿信标，这些补偿信标随着距孔的距离的增加逐渐用补偿信标探测大气湍流。这些技术的性能通过使用平均Strehl比和落在目标平面上的光束的径向平均强度进行评估。仿真结果表明，与其他两种技术相比，自举技术在大多数实际感兴趣的湍流条件下提供了更好的补偿性能。还研究了瑞利信标产生的功率要求。已经发现，能够在每个脉冲中产生大约3J的激光脉冲能量的激光器适合于在该工作中描述的激光投影系统。

著录项

  • 作者

    Sergeyev, Aleksandr.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Engineering Electronics and Electrical.; Physics Optics.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;
  • 关键词

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