占空比对相干组束影响的实验研究

Experimental Study on Coherent Beam Combination in Lasers Array in Different Duty Ratios

研究了相干组束中激光器阵列出射光束的占空比,对相干组束后远场中心光斑能量比值的影响,进行了理论分析,并在一维二路自成像相干组束实验中,进行了占空比调节的实验。理论分析认为,在一定单元出射光束宽度下,增大占空比值,可以提高相干组束后中心光斑能量比值,同时可以减少次级光斑的数量。通过实验验证,当光束的腰斑不大于1 mm时,相邻光束间距从2.06 mm增大至6.02 mm,中心光斑能量比从42%降至11.13%。

In the coherent beam combination of lasers array,the duty ratio has influence on efficiency of coherent beam combination,which is researched with mathematic analysis.Coherent beam combination experiment with 1×2 laser arrays is carried out in self-Fourier cavity.The result of mathematic analysis shows that through increasing the duty ratio,the energy duty of the central spot increases,and the number of secondary spot decreases.It is proved by the results of experiment that the energy duty of the central spot decreases from 42%to 11.13%,when the distance of two adjacent beam increases from 2.06 mm to 6.02 mm.