纳秒脉冲控制精度对多光束组束的影响

在多束脉冲激光叠加过程中，脉冲的同步延时控制精度和脉宽控制精度对叠加光束能量分布具有重要影响。基于光束叠加理论，建立了四束脉冲激光能量叠加模型，以四束整形脉冲为入射光源，分别针对同步延时控制精度和脉宽控制精度变化情况下叠加脉冲能量分布进行了定量计算。结果表明，随着同步延时控制精度和脉宽控制精度的降低，叠加脉冲的脉宽增加，峰值降低。多束脉冲的同步延时控制精度和脉宽控制精度的变化对激光组束的影响比单束脉冲的影响更大。四束激光合成系统中，在其他参数不变的情况下，叠加光束激光脉冲峰值光强变化率小于5%时，单束激光脉冲延时变化率和脉宽变化率保持在3.2%和10.9%以内。因此，脉冲延时对叠加光强影响更大。

Effect of nanosecond pulse control precision on multi-beam beams

In the process of multi-beams pulse laser synthesis, the synchronization time delay control precision and the pulse width control precision have important influence on the final distribution of the superposition beam energy. Based on the beam superposition theory, four beam pulsed laser light energy superposition model was established. Four beam shaping pulse as the incident light source, respectively, the superposition pulse energy distribution was calculated by the synchronization time delay control precision and the pulse width control precision. The results show that, with the decrease of the synchronization control precision and the pulse width control precision, pulse width of the superimposed pulse increase and the peak intensity reduce. The multi-beam beams will have greater influence on synthesis beam than single beam. In four laser synthesis system, when other pulse parameters remain unchanged and if the laser pulse peak intensity change rate is less than 5%, the single beam laser pulse time delay and pulse width change rate are kept within 3.2% and 10.9%. Therefore, the effect of pulse time delay on the synthesis intensity is even greater.