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51.
提出了一种基于介电润湿效应的三液体透镜与传统固定透镜组合的三组元结构变焦光学系统.在一、三组元固定不变的情况下,通过移动中间三液体透镜组改变系统焦距,并通过三液体透镜的自变焦特性,确保系统在变焦的同时保持像面位置不变.采用光焦度高斯括号法求解系统的初始结构参量,利用Zemax光学软件进行系统设计与优化,最后对系统的成像质量进行分析.结果表明:该系统总长22mm,可实现2.7~20.3mm范围内的连续变焦,系统变倍比接近8,在空间频率180lp/mm处调制传递函数值均大于0.4. 相似文献
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A theoretical model is proposed to describe the mechanism of
laser-induced plasma shock wave evolution in air. To verify the
validity of the theoretical model, an optical beam deflection technique
is employed to track the plasma shock wave evolution process. The
theoretical model and the experimental signals are found to be in
good agreement with each other. It is shown that the laser-induced
plasma shock wave undergoes formation, increase and decay processes;
the increase and the decay processes of the laser-induced plasma
shock wave result from the overlapping of the compression wave and
the rarefaction wave, respectively. In addition, the laser-induced
plasma shock wave speed and pressure distributions, both a
function of distance, are presented. 相似文献