基于轴棱锥用主被动方式产生短脉冲高功率近似无衍射光  

Generation of short pulse and high power non-diffracting beam by active and passive schemes based on axicon

作　　者：吴逢铁[1] 郭东栋[1] 陈云彬[1] 邱振兴[1] 

机构地区：[1]华侨大学信息科学与工程学院

出　　处：《光学精密工程》2007年第11期1692-1697,共6页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.60477041);福建省自然科学基金计划资助项目(No.A0710011No.A0410017)

摘　　要：利用轴棱锥构成的Bessel-Gauss谐振腔,首次由灯泵Nd:YAG调Q激光器主动式直接输出纳秒高功率近似无衍射Bessel-Gauss光脉冲。应用衍射理论给出的Bessel-Gauss场分布模型对结果进行分析,数值模拟和实验结果基本吻合。同时利用带抗共振环(ARR)的Nd:YAG调Q激光器输出的高稳定纳秒高斯脉冲,通过Axicon的光束整形,由被动方式获得近似理想的纳秒无衍射零阶Bessel光。利用胶片扫描法记录了光强分布的精细结构,测定得出无衍射光的中心光斑半径约为90μm,峰值功率密度高达2.3×109W/cm2。分析比较了主动和被动方式产生纳秒无衍射光的特性和优缺点。Based on an axicon-based Bessel-Gauss resonator, a nanosecond high power non-diffracting pulsed Bessel-Gauss beam was generated directly from a flashlamp pumped Q switched Nd：YAG laser for the first time. The experimental results were analyzed using the Bessel-Gauss model deduced from the diffraction integral theory and they were consistent with the numerical simulation. On the other hand, by a high stability nanosecond Gaussian pulse generated from a Q switched Nd：YAG laser with an anti-resonant ring and pulse shaping passing through an axicon, a nanosecond non-diffracting zero order Bessel beam was obtained using the passive method. A film-scanning was used to record the fine structure of the intensity profile.and a beam analyzer to measure the pulse characteristics. The measured results show that the central spot size is about 90 μm and the peak power density of the central spot reaches to 2.3 × 10^9 W/cm^2. Finally, the active and passive schemes for generating the nanosecond non-diffracting beam were compared and analyzed.

关 键 词：无衍射光 纳秒光脉冲 贝塞耳光 贝塞耳-高斯光 轴棱锥 

分 类 号：TN242[电子电信—物理电子学]