A method to reduce crosstalk in multi-view autostereoscopic three-dimensional (3D) displays based on the lenticular sheet is proposed. Correcting the luminance values of each parallax image displayed on the display screen is employed. We analyze the causes of crosstalk. We deduce the formulas of crosstalk reduction according to the relationship between crosstalk coefficients of each parallax image observed through the lenticular sheet, luminance values of each parallax image displayed on the display screen, and luminance values of each parallax image observed through the lenticular sheet at each viewing position. Experimental results verify the effectiveness of the proposed method.

设计了一个激光光斑实时监测与光路自动准直装置,能够实时监测激光光斑并自动准直激光输出方向。基于透镜成像原理,使用CCD探测器获得光斑的二维成像,并根据两点确定一条直线原理和使用压电陶瓷电动调整架实现光路自动准直; 监测控制程序采用虚拟仪器开发软件Lab View编写,可以实时监测激光光斑模式与光斑位置抖动情况,并进行反馈控制。经测试,设计装置的调整精度达0.5 μrad,反馈控制频率约1 Hz,完全可降低或消除抖动周期在1 s以上的光斑飘移。

We describe a Ti:sapphire multi-pass amplifier with high efficiency at the repetition rate of 1 kHz. In the amplifier, the incident pulse is 0.66 mJ with the pulse duration about 90 ps. The incident pulse is amplified to 7.2 mJ when the pump energy is 23 mJ. The energy efficiency in the amplifier is nearly 30% with extracting efficiency larger than 40% when considering about 25% static reflecting loss in the amplifier. After compressed in the compressor, 5.4-mJ, 36-fs pulses with peak power larger than 0.1 TW are obtained.

It is observed that the pulse duration of loosely focused pulses is self-compressed during the nonlinear propagation in argon when the input pulse peak power is close to the threshold power for self-focusing, and the results are confirmed by the numerical simulation. From the simulation we find that, near the lens focus the central part of the beam moves forward to the outer part owing to the plasma generation, and produces a leading peak in the temporal profile. And then, with the decrease of the plasma density, the spatio-temporal focusing and self-steepening effects predominate and promote a shock beam structure with a steep trailing edge. It is also found that, for our calculation case with the input pulse power close to the critical value of self-focusing, group velocity dispersion and multiphoton absorption effect have little influence on the propagation process, but the spatio-temporal focusing and self-steepening effects play a significant role in promoting the final pulse shortening.