血管中的血液流动会对血管壁产生周向应力，周向应力与血管的结构及功能变化密切相关，测量体外血管模型的周向应力是生物力学研究中较重要的问题。提出了利用光纤光栅测量血管周向应力的方法，基于微流控技术利用钢针模具建立了集成光纤光栅的三维圆形血管模型，通过仿真研究了不同流动速度与应力的关系。仿真结果得到流速在8 mm/s～75 mm/s范围内，应力随速度的改变呈线性变化。利用光纤光栅传感器测量了流体流动时产生的周向应力，根据实验得到了光栅波长改变量与速度的关系，流速范围在8 mm/s～75 mm/s之间变化时，速度引起波长的变化为0.173 nm。结合仿真实验得到了应力与光栅波长改变量的关系，为血液流动时产生周向应力的体外测量提供了新思路。

This Letter describes an approach to encode complex-amplitude light waves with spatiotemporal double-phase holograms (DPHs) for overcoming the limit of the space-bandwidth product (SBP) delivered by existing methods. To construct DPHs, two spatially macro-pixel encoded phase components are employed in the SBP-preserved resampling of complex holograms. Four generated sub-DPHs are displayed sequentially in time for high-quality holographic image reconstruction without reducing the image size or discarding any image terms when the DPHs are interweaved. The reconstructed holographic images contain more details and less speckle noise, with their signal-to-noise ratio and structure similarity index being improved by 14.64% and 78.79%, respectively.

This Letter proposes a scanned holographic display system that takes the advantage of a high-speed resonant scanner to augment a galvanometer and hence improves the opto-mechanical information distribution capabilities, thereby potentially achieving an increased image size and enlarged viewing angles.

A simple and effective approach is proposed to minimize the effect of unmodulated light and uneven intensity caused by the pixelated structure of the spatial light modulator in a holographic display. A more uniform image is produced by purposely shifting the holographic images of multiple reconstructed lights with different incident angles from the zero-diffraction-order and overlapping those selected different orders. The simulation and optical experimental results show that the influence of the zero-diffraction-order can be reduced, while keeping the good uniformity of the target images by this new approach.