... 光束束宽（Beam width） 远场发散角（Beam divergence angle） 瑞利长度（Rayleigh length） ...
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The analysis showed that the near-field phase distribution is greatly influenced by mirror tilt, and the far-field intensity distribution is not affected greatly;the far-field divergence angle and beam waist width are increased,but the M~2 value is still small.
理论分析表明，腔镜的小角度倾斜对近场相位影响较大，但对远场光强空间分布影响不大；随着倾斜角度不断增大，远场发散角和光束腰宽度也增大，光束质量虽然存在恶化的趋势，但光束质量因子肝值仍然较小，离轴非稳腔仍能保持高光束质量的输出。
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衍射理论的另一个重要应用就是研究准直光束的远场发散角。
Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.
束宽和远场发散角的相对误差随球差系数绝对值的增加和光束阶数的减小而增加；
The relative errors of the beam width and far-field divergence angle introduced by the spherical aberration increase with increasing spherical aberration coefficient and decreasing beam order.
由于光泵浦热效应，高功率固体激光器的输出参数如光束远场发散角、输出功率等会发生变化。
The output parameters such as beam divergence angle in far-field output power of high power solid state lasers are variable due to thermal effect of optical pumping.
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