高斯光束小尺度自聚焦的临界功率

发布时间：2018-03-05 15:30

本文选题：非线性光学　切入点：自聚焦　出处：《激光与光电子学进展》2017年01期 　论文类型：期刊论文

【摘要】：通过理论分析和数值模拟研究了高斯光束发生小尺度自聚焦(SSSF)的临界功率。发现高斯光束小尺度自聚焦的临界功率与初始调制幅度有关。初始调制幅度越大,高斯光束分裂成丝所需的功率越小;初始调制幅度越小则要求功率越大。当高斯光束输入功率低于高斯光束小尺度自聚焦临界功率,但高于整体自聚焦临界功率时,在非线性介质中传输时将以全光束塌陷的形态聚焦为一点;当高斯光束的初始输入功率高于高斯光束小尺度自聚焦临界功率时,在非线性介质中传输的高斯光束将分裂形成多根高强度的细丝。在高斯光束非线性传输过程中,整体自聚焦和小尺度自聚焦效应之间存在相互竞争,竞争的结果由高斯光束的初始参数决定。
[Abstract]:The critical power of small scale self-focusing (SSSFs) of Gao Si beam is studied by theoretical analysis and numerical simulation. It is found that the critical power of small scale self-focusing of Gao Si beam is related to the initial modulation amplitude. The smaller the power required for Gao Si beam to split into filaments, and the smaller the initial modulation amplitude, the greater the power. When the input power of Gao Si beam is lower than the critical power of small scale self-focusing of Gao Si beam, but higher than that of the whole self-focusing critical power, When propagating in a nonlinear medium, the whole beam collapses into a single point, and when the initial input power of Gao Si beam is higher than that of Gao Si beam, Gao Si beams propagating in nonlinear media will split into many high intensity filaments. In the nonlinear propagation of Gao Si beams, there is competition between global self-focusing and small-scale self-focusing. The result of competition is determined by the initial parameters of Gao Si beam.
【作者单位】：天津大学精密仪器与光电子工程学院激光与光电子研究所;珠海光库科技股份有限公司;
【基金】：广东省产学研合作项目(2014B090905016) 广东省应用型科技研发专项资金项目(2015B090921006)
【分类号】：O437.5

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