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。
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。
The new definition of the beam propagation factor for partially coherent light is proposed through the propagation equations of the cross-spectral density.
并依据部分相干光的交叉光谱密度的傍轴传输方程，重新定义了普遍的部分相干光的传输因子。
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