Ha Woosung, Lee Sejin, Jung Yongmin, Kim Jun Ki, Oh Kyunghwan
Institute of Physics and Applied Physics, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea.
Opt Express. 2009 Sep 28;17(20):17536-46. doi: 10.1364/OE.17.017536.
We report efficient acousto-optic control of speckle contrast at the output of multimode fibers (MMFs) using a cylindrical piezoelectric transducer (PZT) vibrating in the radial direction. With appropriate packaging of an MMF around the PZT, periodic stretching and subsequent intensity modulation were achieved over the wound fiber to result in time-averaged smoothing of the output within a short time. It was experimentally confirmed that light passed through the vibrating PZT-fiber assembly maintains the virtually partial coherence irrespective of the guide length and power splitting. Real-time vibration-off/on movies were presented, and their single-frame excerpts were analyzed.
我们报道了利用沿径向振动的圆柱形压电换能器（PZT）对多模光纤（MMF）输出端的散斑对比度进行高效的声光控制。通过在PZT周围对MMF进行适当封装，在缠绕的光纤上实现了周期性拉伸以及随后的强度调制，从而在短时间内实现输出的时间平均平滑。实验证实，无论光纤长度和功率分配如何，通过振动的PZT - 光纤组件的光都保持几乎部分相干。展示了实时振动开/关的动态影像，并对其单帧片段进行了分析。
