论文部分内容阅读
针对美国劳伦斯?利弗莫尔国家实验室所提出的四柱透镜结构的线聚焦型空间滤波器(线型滤波器),根据瑞利-索末菲衍射积分和利用Matlab软件对光束在线型滤波器中的传输进行了理论模拟研究,得到了线型滤波器的像传递模式并对其空间滤波功能进行了对比研究。与传统的针孔滤波器不同,线型滤波器的系统前后焦面并不只与透镜焦距有关,还与柱面镜在x和y方向错开的距离相关,其优点是能将高功率激光装置中的远场强度降低约3个数量级,从而大大减小滤波器规模,但同时也带来一个不足之处,即线型滤波器只能在1倍口径匹配条件下满足严格的像传递功能。在1倍口径匹配条件下,线型滤波器的空间滤波功能与传统针孔滤波器也是一致的。
According to the four-column lens-based linear focusing spatial filter (linear filter) proposed by Lawrence Livermore National Laboratory in the United States, according to the Rayleigh-Sommerfeld diffraction integral and Matlab software, The simulation results show that the image transmission mode of the linear filter and its spatial filtering function are compared. Unlike traditional pinhole filters, the front and rear focal planes of a linear filter are not only related to the focal length of the lens but are also related to the distance that the cylindrical mirrors are offset in the x and y directions. This has the advantage that high-power laser devices Of the far-field intensity is reduced by about 3 orders of magnitude, thus greatly reducing the size of the filter, but also brings a shortcoming that the linear filter can only meet the strict image transfer function under the condition of 1 times of aperture matching. The linear filter’s spatial filtering capability is also consistent with traditional pinhole filters at 1 times the aperture matching.