基于截止滤光片的光束空间低通滤波技术研究  

Low-pass spatial filter for laser beam based on cutoff filters

作　　者：郑光威[1] 郑秋容[1] 楚兴春[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《红外与激光工程》2016年第B05期60-64,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(61205002)

摘　　要：由于截止滤光片具有的良好光学特性,分别给出了基于两片长波通和两片短波通截止滤光片的光束空间低通滤波装置。利用几何光学法,分别研究了这两种装置对光束的一维空间低通滤波特性,结果表明:这两种滤波装置的角谱选择性带宽与滤光片过渡带的带宽以及两滤光片的夹角有关。对于长波通滤光片,两滤光片的夹角要大于等于截止角度的2倍,而对于短波通滤光片,两滤光片的夹角要小于等于截止角度的2倍,理论上得出这两种装置的半高宽度的角谱选择性带宽均等于过渡带的宽度结论,此时两滤光片之间的夹角为截止角度的2倍。Due to the fine optical characteristics of cutoff filter, the configurations based on two pieces of long-pass cutoff filter or two pieces of short-pass cutoff filter were put forward respectively. Based on the geometrical optics, the performances of these two configurations were analyzed. The results show that the angular spectrum bandwidths of these two configurations depend on both the intersection angle between the cutoff filters and the angular bandwidth of transition zone. For the long-wave-pass cutoff filter, the intersection angle must be no less than two times of its cutoff angle. While for the short-wavepass cutoff filter, the intersection angle must be no more than two times of its cutoff angle. Theoretically,its minimum bandwidth is equal to the angular bandwidth of transition zone, when the intersection angle is two times of the cutoff angle.

关 键 词：空间低通滤波 角谱选择性带宽 截止滤光片 长波通 短波通 几何光学 

分 类 号：O484.8[理学—固体物理]