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arXiv 1303.3161physics.optics
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全光反馈实时波前整形

Real-time wavefront-shaping through scattering media by all optical feedback

Micha Nixon, Ori Katz, Eran Small, Yaron Bromberg, Asher A. Friesem, Yaron Silberberg, Nir Davidson

摘要:

聚焦光通过动态变化的异质介质是一个抢手的目标,具有重要的应用范围从自由空间通信纳米手术。潜在的挑战是控制的光学波前与大量的自由度(DOF)的时间尺度短于介质的动态。最近,在使用具有>1000 DOF的空间光调制器(SLM)通过波前整形聚焦穿过混浊样本的演示之后,已经报道了许多进步。不幸的是,基于SLM的波前整形需要来自检测器/相机的反馈,并且仅限于缓慢变化的样本。在这里,我们展示了一种新的方法,波前整形使用全光反馈。我们表明,通过高度散射的样品,包括薄的生物组织,可以在亚微秒的时间尺度上产生的复杂的波前聚焦的过程中的字段自组织内的多模激光腔,而不需要电子反馈或SLM。这种波前整形机制比现有技术快五个数量级以上,达到了许多应用所需的时间尺度。

英文摘要:

Focusing light through dynamically varying heterogeneous media is a sought-after goal with important applications ranging from free-space communication to nano-surgery. The underlying challenge is to control the optical wavefront with a large number of degrees-of-freedom (DOF) at timescales shorter than the medium dynamics. Recently, many advancements have been reported following the demonstration of focusing through turbid samples by wavefront-shaping, using spatial light modulators (SLMs) having >1000 DOF. Unfortunately, SLM-based wavefront-shaping requires feedback from a detector/camera and is limited to slowly-varying samples. Here, we demonstrate a novel approach for wavefront-shaping using all-optical feedback. We show that the complex wavefront required to focus through highly scattering samples, including thin biological tissues, can be generated at sub-microsecond timescales by the process of field self-organization inside a multimode laser cavity, without requiring electronic feedback or SLMs. This wavefront-shaping mechanism is more than five orders of magnitude faster than state-of-the-art, reaching the timescales required in many applications.

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