基于对强飞秒激光大气传输的非线性薛定谔方程的变分法,模拟研究飞秒激光大气传输成丝特性.研究了在是否考虑多光子吸收损耗的情况下,激光成丝状态的演化.研究表明:多光子吸收损耗会破坏自聚焦与等离子体散焦之间的动态平衡,进而引起成丝的不稳定性；在不同的入射功率下,成丝的起点位置会发生移动；在实验室条件下,Pin≥3pcr时才可能形成多次聚焦成丝传输.继续增加激光入射功率时,光束因强烈聚焦发生崩塌而成多丝结构.
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