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| 圆柱偏振贝塞耳-高斯光束经高数值孔径透镜的聚焦 | |
| 引用本文： | 张志明,蒲继雄,王喜庆.圆柱偏振贝塞耳-高斯光束经高数值孔径透镜的聚焦[J].中国激光,2008,35(3):401-405. |
| 作者姓名： | 张志明 蒲继雄 王喜庆 |
| 作者单位： | 张志明:西南交通大学理学院物理系, 四川 成都 610031 蒲继雄:华侨大学电子科学与技术系, 福建 泉州 362021 王喜庆:西南交通大学理学院物理系, 四川 成都 610031 |
| 基金项目： | 国家自然科学基金 , 福建省科技计划 |
| 摘 要： | 利用里查德-沃耳夫(Richards-Wolf)矢量衍射积分模型,推导了圆柱偏振贝塞耳-高斯(CPBG)光束经高数值孔径透镜聚焦的光场表达式,并用数值计算分析了各相关参数的取值变化对焦面及焦点附近光强分布的影响。研究表明,焦面光强大小及光强剖面形状与贝塞耳函数项相关参数β,偏振旋转角0,光束束腰宽度w0和数值孔径角α的取值相关。通过控制各相关参数的取值,在聚焦场中获得了有广泛实际应用的具有涡旋性质的局域空心光束和平顶光束。 |
| 关 键 词： | 非线性光学 高数值孔径 贝塞耳-高斯光束 里查德-沃耳夫矢量衍射积分 圆柱偏振 涡旋 |
| 收稿时间： | 2007/9/25 |
Focusing of Cylindrically Polarized Bessel-Gaussian Beams through a High Numerical-Aperture Lens |
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| Zhang Zhiming,Pu Jixiong,Wang Xiqing.Focusing of Cylindrically Polarized Bessel-Gaussian Beams through a High Numerical-Aperture Lens[J].Chinese Journal of Lasers,2008,35(3):401-405. | |
| Authors: | Zhang Zhiming Pu Jixiong Wang Xiqing |
| Abstract: | The light field expressions of cylindrically polarized Bessel-Gaussian (CPBG) beams focused by a high numerical-aperture lens are derived using Richards-Wolf vectorial diffraction method. Numerical calculations are taken to analyze the influences of varying values of the parameters on the light intensity distribution at the focal plane and in the vicinity of focus. The research results show that both the intensity at the focal plane and its profile shape depend on the values of parameter β corresponding to Bessel function, polarization rotation angle φ0, beam waist width w0 and the maximal angle α determined by the numerical-aperture. By adjusting the values of corresponding parameters, the bottle beams and the flat-topped beams which possess the characteristics of vortex are obtained and will have many significant applications. |
| Keywords: | nonlinear optics high numerical-aperture Bessel-Gaussian beams Richards–Wolf vectorial diffraction cylindrically polarization vortex |
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