论文部分内容阅读
自从第一次观察到飞秒激光大气成丝后,光丝备受科学家的关注。它的潜在应用价值主要包括电子加速、激光雷达远程遥感、太赫兹辐射和超短脉冲压缩。利用数值仿真的方法,通过改变艾里光束的衰减系数,研究了不同能量背景的环形艾里光束飞秒激光大气成丝特性,得到的光丝长度长于拥有相同峰值功率、弱能量背景高斯光束形成的光丝。通过分析飞秒激光光丝演化过程的时间和空间特性,发现了环形能量背景是环形艾里光束沿传播方向形成高能量密度光丝的前提条件。比较了环形艾里光束和高丝光束在成丝过程中的光谱展宽特性,发现不同衰减系数的环形艾里光束具有相似的光谱展宽特性,但要明显弱于高斯光束的光谱展宽。研究成果对与提升飞秒激光成丝效果具有参考意义。
Since the first observation of the femtosecond laser air into the silk, the light of the scientists much attention. Its potential applications include electron acceleration, lidar remote sensing, terahertz radiation and ultrashort pulse compression. The numerical simulation method was used to study the atmospheric characteristics of the femtosecond laser in the annular Erie beam with different energy background by changing the attenuation coefficient of the Erie beam. The obtained filament length was longer than that of the Gaussian beam with the same peak power and weak energy Light wire. By analyzing the temporal and spatial characteristics of the femtosecond laser light, we found that the annular energy background is the prerequisite for the formation of high energy density light in the direction of propagation. The spectral broadening characteristics of toroidal and high-beam beams in the process of filament formation were compared. It was found that the toroidal Erie beams with different attenuation coefficients had similar spectral broadening characteristics, but were weaker than the spectral broadening of Gaussian beams. The research results have reference value to improve the effect of forming femtosecond laser wire.