空心新型光阱的实验研究  

Experimental Research of Doughnut, a New Kind of Laser Trap

作　　者：尹良红[1] 李银妹[1] 楼立人[1] 张达[1] 陈洪涛[1] 

机构地区：[1]中国科学技术大学选键化学开放实验室/物理系,安徽合肥230026

出　　处：《中国激光》2003年第3期211-215,共5页Chinese Journal of Lasers

基　　金：国家基金委 (1 0 0 72 0 6 2 ;1 9890 380 )资助项目

摘　　要：介绍了用锥镜法和取高级衍射光斑法来实现空心光阱的实验方法。用实验定性地证明了空心光阱轴向捕获力高于实心光阱。用图像分析法比较了空心光阱与实心光阱近中心横向光阱刚度 (光焦点附近小范围内的光阱横向刚性程度 ) ,表明同等条件下空心光阱的近中心横向光阱刚度弱于实心光阱。用流体力学法测量光阱的逃逸阱力随光功率的变化 ,表明同等条件下空心光阱的逃逸阱力大于实心光阱 ,因此空心光阱操纵微粒具有更高的稳定性。同时指出了空心光阱具有更低的热损伤 ,在低倍物镜下空心光阱具有更高的实用价值 。The experimental method used to form doughnut laser trap through axicons and by extracting high-order diffractive light component is introduced. It is demonstrated qualitatively that doughnut laser trap has higher axial trapping force than Solid laser trap. The centrical horizontal trap stiffness of doughnut laser trap and solid laser trap is measure by the method of image analyzing. The result demonstrates that solid laser trap is more rigid. The escaping force of laser trap, varying corresponding to different laser power, is measured by fluid mechanical method. The result demonstrates that doughnut laser trap has higher escaping force, thus can manipulate particles with more stability. It is indicated that doughnut laser trap brings lower thermal damnification, makes best use of low magnification objective lens, and helps to develop double laser traps.

关 键 词：激光物理 空心光阱 角锥透镜 高级衍射光斑法 轴向捕获 横向捕获 逃逸阱力 

分 类 号：O435[机械工程—光学工程]