The definition of beam width is significant for the quality of laser beam.
在激光光束质量问题中，光束束宽的定义至关重要。
2
Based on the definition simple beam, the finite element method is used to analyse some simple beams, with symmetric structure and loading, and symmetric beams, with different support.
从简支梁定义出发，应用有限元法，对结构、受力对称的简支梁以及不同支承的对称梁进行了计算。
3
The new definition of the beam propagation factor for partially coherent light is proposed through the propagation equations of the cross-spectral density.