摘要
利用Collins公式推导了余弦平方高斯光束(CSGB)通过无光阑透镜光学系统聚焦后的光强分布及梯度力表达式。通过数值模拟讨论了光束参数、光束入射距离及系统菲涅耳数的变化对梯度力分布及光阱的数量、位置及尺度的影响。结果表明,光束相关参数越大光阱的数量越多,光阱的位置随光束入射距离而改变,系统菲涅耳数增加光阱尺度减小,而位置不变。
The intensity distribution and gradient force pattern of cosine- squared Ganssian beams focused by a thin lens without aperture were derived based on the Collins formula. Through the numerical simulation, the influence of the beams parameter, relative incident separation and beams Fresnel number on the distribution of gradient force pattern and the numbers, position and size of optical traps were discussed. The results indicated that the bigger of the beams parameter the more of the optical traps, the positions of which change with beams relative incident separation,and the size decreased with the increase of Fresnel number of the system while the position is unchanged.
出处
《激光杂志》
CAS
CSCD
北大核心
2012年第3期21-22,共2页
Laser Journal
关键词
余弦平方高斯光束
无光阑透镜
梯度力
光阱
cosine - squared Gaussian beams
thin lens without aperture
gradient force pattern
optical trap
