CAJ | 학술논문

介绍了一种适用于三束激光非相干叠加聚焦的新型激光发射光学系统，工作波长1080 nm，全视场角0.6o。系统为离轴两镜反射结构，对三束紧密排列的激光光束进行扩束聚焦，系统主镜为口径303 mm的椭球面反射镜，系统像质接近衍射极限，并且可以通过控制次镜轴向位置调焦适应不同目标距离。计算了叠加后的激光光斑的功率密度分布和环围功率曲线，设计在目标距离1000 m时叠加光斑半径9 mm内的环围功率大于95%，此激光发射系统结构简单，长径比小，聚焦质量满足使用需求，激光光斑能量得到有效叠加。
개소료일충괄용우삼속격광비상간첩가취초적신형격광발사광학계통，공작파장1080 nm，전시장각0.6o。계통위리축량경반사결구，대삼속긴밀배렬적격광광속진행확속취초，계통주경위구경303 mm적타구면반사경，계통상질접근연사겁한，병차가이통과공제차경축향위치조초괄응불동목표거리。계산료첩가후적격광광반적공솔밀도분포화배위공솔곡선，설계재목표거리1000 m시첩가광반반경9 mm내적배위공솔대우95%，차격광발사계통결구간단，장경비소，취초질량만족사용수구，격광광반능량득도유효첩가。
A new optical design of laser beam expander is introduced. It suits for three laser beams to be expanded and focused. Its operation wavelength is 1 080 nm and its full field of view 0.6 degrees. A two-mirror catoptrical telescope is designed for expanding and focusing three beams which are arranged in a close configuration. Its primary is an ellipsoid mirror with aperture diameter of 303 mm. Its focusing performance approaches to the diffraction limitation. And focusing at different target ranges is implemented through control of the axial position of the secondary mirror. The power density distribution and power in the bucket curve of combined and focused laser spots are calculated with the aid of computer simulation. When focused at one kilometer, the ratio of the spot power in the bucket of 9 mm radius to the total power is over 95 percent. This new kind beam expander has the advantages of simple and low length-to-aperture-diameter ratio. The system focusing performance satisfied the usage requirement. The power of laser spots is effectively combined.