In chapter three, the trapping force of strong focused laserbeam exerting to Mie particles and Rayleigh particles is calculated.
第二章介绍了激光捕获技术的基本原理，阐述了光镊捕获和操控粒子的机制。
2
But, when the doughnut laserbeam is used as trapping light, relative index can be less than 1. The beam waist of focused laserbeam has a virtual affection for the trapping force.
但是，在空心光束中可以实现对地折射率粒子的稳定捕获，即粒子的相对折射率可以小于1。
3
In chapter 4, laser cooling and trapping and applications of ultracold atoms are reviewed. The beam and atom interaction theory is analyzed.