【摘要】 相干并束是获得高功率激光束的一种有效方法,特殊设计的二维正弦相位光栅是一种较好的并束元件。介绍了二维正弦相位光栅并束的设计方案,计算表明,在3×3和4×4分束时分束效率分别为81.1%和73.1%,与常用的达曼光栅相比分别提高37%和26.9%。对正弦相位光栅的制作和误差分析表明,并束效率存在极大值,给光栅的制作带来较大的误差宽容度,分束与并束在光栅表面的光场存在一定差别。如果仅用于并束,并束效率还有提高的可能。更多还原

【Abstract】 Coherent beam combination is an effective method to get a high power beam.Two-dimensional(2D) sine phase grating of special design is a perfectly combining element.The design of 2D sine phase grating is introduced,and computational results indicate that the high splittering efficiencies are 81.1% and 73.1%,which increase 37% and 26.9% compared with conventional Dammann gratings respectively in the case of 3×3 and 4×4 beam-splitting.The fabrication of 2D sine phase grating and errors are analyzed ,and the results show that coupling efficiency of combination has a maximal value leading to greater error latitude for the fabrication of sine phase grating. Splittering and combination light field are different on phase grating surface. The coupling efficiency can be improved,if the phase grating is only used for combination.更多还原