The basic physical characteristics of electrons accelerated by two linearly polarized and circularly symmetric crossed Laguerre-Gaussian （LG） laser beams with equal frequency and amplitude in vacuum are studied in d...The basic physical characteristics of electrons accelerated by two linearly polarized and circularly symmetric crossed Laguerre-Gaussian （LG） laser beams with equal frequency and amplitude in vacuum are studied in detail. The condition, under which electrons can be accelerated effectively, and the energy gain are discussed.展开更多
We demonstrate an end-pumped, c-cut Nd：YVO4 laser that emitted first-order Laguerre-Gaussian （LGol） beam by adjusting the position of focused pump beam relative to laser crystal. The pumping light reached the laser...We demonstrate an end-pumped, c-cut Nd：YVO4 laser that emitted first-order Laguerre-Gaussian （LGol） beam by adjusting the position of focused pump beam relative to laser crystal. The pumping light reached the laser crystal has circular and solid intensity profile. The laser is compact and stable, and the obtained LG01 beam power reaches 202 mW with -25% slope efficiency.展开更多
A novel technique of producing azimuthal index 1>1 doughnut beam of good quality by use of multi-liquid crystal cells is presented, it has the advantages of high conversion efficiency and flexibility.
为了从系统的角度研究大气湍流对涡旋光束传播质量的影响,根据广义惠更斯-菲涅尔积分和Kolmogorov湍流大气原理,利用傅里叶光学分析方法和光束分步传播法对携带有轨道角动量(OAM)的拉盖尔-高斯(LG)光束在湍流大气中的传播进行理论分析...为了从系统的角度研究大气湍流对涡旋光束传播质量的影响,根据广义惠更斯-菲涅尔积分和Kolmogorov湍流大气原理,利用傅里叶光学分析方法和光束分步传播法对携带有轨道角动量(OAM)的拉盖尔-高斯(LG)光束在湍流大气中的传播进行理论分析与数值仿真,导出角谱形式的衍射模型及其对应的抽样限制条件。利用桶中功率(PIB,power in bucket)计算方法,分析湍流强度对不同OAM值的LG光束质量的影响;引入高斯光束和点光源,对比评估典型光束的抗湍流能力。数值仿真结果表明:受大气湍流影响,随着LG光束在湍流大气中传播距离增加,光束会聚能力变弱有明显扩散;光束本身特有的环状光强分布及其相应的相位分布都受到不同程度的破坏,损伤程度与光束本身携带的OAM数有关;点光源对湍流的影响最为敏感;高斯光束具有与小OAM值的LG光束相比拟的抗湍流能力,且比大OAM数的LG光束有更强的抗湍流能力。展开更多
基金Project supported by the National Natural Science Foundation of China （Grant No 10574097）.
文摘The basic physical characteristics of electrons accelerated by two linearly polarized and circularly symmetric crossed Laguerre-Gaussian （LG） laser beams with equal frequency and amplitude in vacuum are studied in detail. The condition, under which electrons can be accelerated effectively, and the energy gain are discussed.
文摘We demonstrate an end-pumped, c-cut Nd：YVO4 laser that emitted first-order Laguerre-Gaussian （LGol） beam by adjusting the position of focused pump beam relative to laser crystal. The pumping light reached the laser crystal has circular and solid intensity profile. The laser is compact and stable, and the obtained LG01 beam power reaches 202 mW with -25% slope efficiency.
文摘A novel technique of producing azimuthal index 1>1 doughnut beam of good quality by use of multi-liquid crystal cells is presented, it has the advantages of high conversion efficiency and flexibility.
文摘为了从系统的角度研究大气湍流对涡旋光束传播质量的影响,根据广义惠更斯-菲涅尔积分和Kolmogorov湍流大气原理,利用傅里叶光学分析方法和光束分步传播法对携带有轨道角动量(OAM)的拉盖尔-高斯(LG)光束在湍流大气中的传播进行理论分析与数值仿真,导出角谱形式的衍射模型及其对应的抽样限制条件。利用桶中功率(PIB,power in bucket)计算方法,分析湍流强度对不同OAM值的LG光束质量的影响;引入高斯光束和点光源,对比评估典型光束的抗湍流能力。数值仿真结果表明:受大气湍流影响,随着LG光束在湍流大气中传播距离增加,光束会聚能力变弱有明显扩散;光束本身特有的环状光强分布及其相应的相位分布都受到不同程度的破坏,损伤程度与光束本身携带的OAM数有关;点光源对湍流的影响最为敏感;高斯光束具有与小OAM值的LG光束相比拟的抗湍流能力,且比大OAM数的LG光束有更强的抗湍流能力。
