激光初始光场的强度分布特性在一定条件下将影响其远场能量集中度。讨论了空心束的远场光强分布特性,并提出用强度非平整度因子UE来描述随机初始光场的强度分布特性,强度的深度调制将导致能量集中度的下降。高能激光束强度的不均匀分布导致其近场热晕效应类似偏转棱镜, 引起了远场光束的偏转, 有风条件将大大缓解远场光束的偏转。

Initial laser intensity distribution characteristics will affect energy concentration in the far field under some certain conditions. The intensity distribution characteristics of annular beam in the far field is studied. Intensity nonunifomiity factor UE is put forward to describe the initial random intensity distribution. For high power laser, the intensity nonuniformity will cause the deflection of the beam in the far field while no wind.