非傍轴截断余弦高斯光束的光束传输因子  

The Beam Propagation Factor of Nonparaxial Truncated Cosine Gaussian Beams

作　　者：康小平[1] 何仲[1] 冯浩[1] 李长伟[1] 

机构地区：[1]琼州学院理工学院,海南三亚572022

出　　处：《琼州学院学报》2012年第5期14-17,共4页Journal of Qiongzhou University

基　　金：海南省自然科学基金项目(10801);三亚市院校专项资金项目(2010YD25);琼州学院2010年度科研项目(QY515-201002)

摘　　要：基于功率密度的二阶矩方法,对非傍轴截断余弦高斯光束的远场发散角和光束传输因子进行了系统研究.计算结果表明,非傍轴截断余弦高斯光束的光束传输因子不仅与截断参数δ、偏心参数α有关,而且还与初始束腰宽度和波长之比w0/λ有关.当截断参数δ→0时,远场发散角θ0趋于渐近值θ0max=63.4350.Starting from the second - order moment of the power density, the far - field divergence angle and beam propagation factor of nonparaxial truncated cosine Gaussian beams have been systemically investigated. It is shown that the beam propagation factor of nonparaxial truncated cosine Gaussian beams depends not only on the decentered parameter a the truncation parameter 8, but also on the initial waist - width to wavelength ratio w0/λ. When the truncation parameter δ→0, the far - field divergence angle approaches an asymptotic value of θ0max = 63. 4350.

关 键 词：非傍轴截断余弦高斯光束 功率密度 光束传输因子 截断参数 

分 类 号：O435[机械工程—光学工程]