他的idea很简单， 激光束腰(beam waist)大概在微米量级（远远大于单分子的纳米量级），所以可以利用激光束腰的强度梯度来map out目标分子到激光束腰中心的距离。
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Beam-waist 压弯的腰
gaussian beam waist 高斯光束束腰
beam waist light spot size 束腰光斑尺寸
Beam waist diameter 光束腰直径
multi-beam waist 多光腰
beam waist width 束腰宽度
beam waist radius 光腰半径
optimum beam waist 最佳束腰
minimum beam waist 最小光斑
The spot size of laser and its beam waist is the important parameter for assessing the performance of lasers.
激光光斑尺寸和激光束腰光斑尺寸是衡量激光器性能的重要参数。
It is shown that the transformation characteristics depend on optical beam power, the beam waist of incident beams, object distance and lens parameters.
结果表明，它的变换特性依赖于光功率、入射光束的束腰、物距以及透镜参数。
The effect of spherical aberration on the radius of image beam waist in the design of laser optical system is discussed in detail, and the expression is presented.
文章主要针对激光光学系统设计中存在的球差对高斯光束像方束腰半径的影响进行了详细的讨论，并给出了具体关系。
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