用于快点火研究的超短脉冲的相干合成

 利用傅里叶光学方法，建立了一个基于远场的多束超短脉冲相干合成的理论模型。研究了一个口径为50 cm，脉宽为1 ps的超短脉冲相干合成系统的各种误差对脉冲远场时域和空域特性的影响。结果表明：若要求远场的一倍衍射极限区域的积分能量分布达到理想情况下的90％，该系统的相位延迟误差小于0.63，沿x方向角度误差小于0.37 μrad，沿y方向角度误差小于0.34 μrad；若要求远场叠加脉冲的时域展宽小于25％，系统的剩余啁啾因子应小于1.32(不考虑相位延迟)或1.52(考虑0.63的相位延迟)。

Coherent addition of ultrashort pulses for the fast-ignition study

By using the Fourier optics, a theoretical model based on the far field is put forward for the coherent addition of multi-ultrashort pulses. The impacts of all kinds of errors on the temporal and spatial properties in the far field are studied for a system with a 50 cm aperture and 1 ps ultrashort pulses. Results show that the phase-delay error must be less than 0.63 and the rotation errors must be less than 0.37 μrad and 0.34 μrad in the direction of x and y, respectively, with a criterion that the encircled energy in the 1×diffraction limit not less than 0.9 of that in the ideal case. Results also show that the residual chirp factor must be less than 1.32 and l.52 without and with 0.63 phase delay, respectively, with a criterion that the temporal stretch in the far field less than 0.2