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| 截断平顶高斯光束M2因子的比较研究 | |
| 引用本文： | 朱莉华,聂义友,吕百达.截断平顶高斯光束M2因子的比较研究[J].光子学报,2007,36(3):536-538. |
| 作者姓名： | 朱莉华 聂义友 吕百达 |
| 作者单位： | 1. 江西师范大学,物理与通信电子学院,南昌,330027;华东交通大学,基础学院物理系,南昌,330013 2. 江西师范大学,物理与通信电子学院,南昌,330027 3. 江西师范大学,物理与通信电子学院,南昌,330027;四川大学,激光物理与化学研究所,成都,610064 |
| 基金项目： | 江西省自然科学基金资助课题 |
| 摘 要： | 使用熵束宽、渐近分析和环围功率法对截断平顶高斯光束的束腰宽度w、远场发散角θ0和M2因子作了比较研究.结果表明:按不同束宽定义得到的截断平顶高斯光束的w、θ0和M2因子不同,且与截断参量a/w0(a为光阑半宽度,w0为平顶高斯光束初始束腰宽度)有关.随a/w0的增加,三种方法计算得到的w、θ0和M2都分别趋于某常量. |
| 关 键 词： | 激光光学 熵束宽 渐近分析 环围功率 截断平顶高斯光束 M2因子 |
| 文章编号： | 1004-4213(2007)03-0536-3 |
| 收稿时间： | 2005-12-07 |
| 修稿时间： | 2005-12-23 |
A Comparative Study of the M2 Factor of Truncated Flattened Gaussian Beams |
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| ZHU Li-hua,NIE Yi-you,L Bai-da.A Comparative Study of the M2 Factor of Truncated Flattened Gaussian Beams[J].Acta Photonica Sinica,2007,36(3):536-538. | |
| Authors: | ZHU Li-hua NIE Yi-you L Bai-da |
| Institution: | (1 College of Physics & Communication Electronics, Jiangxi Normal University, Nanchang 330027,China) (2 Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064,China) (3 School of Basic Science of Physics,East China Jiaotong University,Nachang 330013,China) |
| Abstract: | Using the entropy-based width, asymptotic analysis and encircled power in the bucket, the waist width w, far-field divergence angle θ0 and M2 factors of a truncated flatted Gaussian beam (FGB) were studied and compared. It is shown that w, θ0 and M2 factors derived by the different definitions are not equal which also depend on the truncation parameter a/w0 (a-half width of the aperture, w0-waist width of the FGB). With increasing of a/w0, w, θ0 and M2 factors calculated by the three methods approach certain constants, respectively. |
| Keywords: | Laser optics Entropy-based width Asymptotic analysis Encircled power in the bucket Truncated Flattened Gaussian Beam(truncated FGB) M2 factor |
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