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首页> 外文会议>Annual solid state and diode laser technology review;SSDLTR 2009; 20090629-0702;20090629-0702; Newton, MA(US);Newton, MA(US) >Phase Locking of a Fiber Array onto a Remote Object
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Phase Locking of a Fiber Array onto a Remote Object

机译：将光纤阵列锁相到远程对象上

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摘要

We report on a novel technique for remotely phase locking an array of high-power optical amplifiers [1] to an object in the far field, thereby optimizing the amount power on the object through atmospheric turbulence, also known as Object In the Loop (OIL) phase locking. Radio frequency (RF) phase modulated light from an array of high-power optical amplifiers propagates to an object in the far field. A fraction of the light incident on the object is then scattered back into the surrounding area. Of the scattered light a small percentage is collected by a lens in a separate return path and imaged onto a detector. The phase-modulated light interfering on the detector generates an RF beat note containing the relative phase errors of each beam with respect to each other. The beat note is then fed back into the Locking of Optical Coherence by Single-Detector Electronic-Frequency Tagging (LOCSET) [2] phasing electronics and, in turn, is used to correct the optical phase error of the individual high-power optical amplifiers via the LiNbO_3 phase modulators in each leg of the phased array. The advantages of OIL phase locking are twofold: (1) OIL phase locking automatically compensates for any atmospheric disturbances that may occur in the propagation path to the object. For a sufficiently small collection aperture the phase corrections applied by the LOCSET [2] phasing electronics are effectively insensitive to any turbulence in the return path and account only for the turbulence in the forward path to the object, thereby optimizing the power on the object; and (2) OIL phase locking provides automatic object tracking limited only by the broad intensity modulation envelope defined by the far-field pattern of the effective aperture of a single high-power optical amplifier and the operating speed of the phase electronics. In this report, we will discuss the experimental demonstration of OIL phase locking and present a simple model to explain the results.
机译：我们报告了一种新技术，该技术可将高功率光放大器阵列[1]远程锁相到远场中的物体，从而通过大气湍流（也称为“回路中的物体”（OIL））来优化物体上的功率量）锁相。来自高功率光放大器阵列的射频（RF）相位调制光传播到远场中的物体。然后，入射到物体上的一小部分光会散射回周围的区域。在散射的光中，一小部分被镜头收集在单独的返回路径中，然后成像到检测器上。干涉检测器的调相光会产生一个RF拍频音，其中包含每个光束相对于彼此的相对相位误差。然后，将节拍音符通过单检测器电子频率标记（LOCSET）[2]调相电子装置反馈到“光学相干锁定”中，进而用于校正各个大功率光放大器的光相位误差。通过相控阵各分支中的LiNbO_3相位调制器。 OIL锁相的优点有两个：（1）OIL锁相可自动补偿到物体传播路径中可能发生的任何大气干扰。对于一个足够小的收集孔径，LOCSET [2]调相电子设备所施加的相位校正实际上对返回路径中的任何湍流不敏感，并且仅考虑了到对象的前向路径中的湍流，从而优化了对象的功率； （2）OIL锁相提供的自动目标跟踪仅受单个高功率光放大器有效孔径的远场模式和相位电子器件的运行速度所定义的宽强度调制包络的限制。在本报告中，我们将讨论OIL锁相的实验演示，并提供一个简单的模型来解释结果。

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