量子电子学报2013，Vol.30Issue(3)：284-287,4.DOI:10.3969/j.issn.1007-5461.2013.03.005
非傍轴余弦平方-高斯光束的传输特性
Propagation characteristics of nonparaxial cosine-squared Gaussian beams
摘要
Abstract
On the basis of the second-order moment of the power density,beam width,far-field divergence angle and M2 factor nonparaxial cosine-squared Gaussian beams were illustrated and analyzed with numerical simulation.The conclusions are as following.1) The waist width W0(0) increases with increasing w0/λ parameter.W0(0) decreases with increasing decentred parameter α when w0/λ is relatively large (w0/λ ≥ 0.5).2) As the parameter w0/λ → 0,the far-field divergence angle approaches an asymptotic value of θ0max =63.435°,which is independent of the decentred parameter α.3) In the nonparaxial regime,the M2 factor of cosine-squared Gaussian beams depends not only on the decentred parameter α,but also on the initial waist-width to wavelength ratio w0/λ,the M2 factor may be less than 1 as w0/λ becomes small enough.The M2 factor does not always vary monotonically with w0/λ for different decentred parameter α,and it increases with increasing w0/λ and reaches the maximum value,then gradually decreases,and finally tends to be a saturated value.关键词
激光光学/非傍轴余弦平方-高斯光束/功率密度/M2因子Key words
laser optics/ nonparaxial cosine-squared Gaussian beam/ power density/ M2 factor分类
数理科学引用本文复制引用
何仲,康小平..非傍轴余弦平方-高斯光束的传输特性[J].量子电子学报,2013,30(3):284-287,4.基金项目
教育部科学技术研究重点项目(208110)、海南省自然科学基金项目(10801)、琼州学院2010年度科研项目(QY515-201002) （208110）
