Most optical oscillator strengths for the transitions between valence band and conduction band are nearly equal to zero.
价带顶和导带底附近的带间跃迁振子强度大部分都近乎为零；
The SCH layer can provide optical confinement, but at the same time, it also affects the distribution of the carrier(especially to the electrons in conduction band).
限制层在提供光学限制的同时，对载流子（主要是导带电子）分布也有影响。
The light path in the conduction process loss, avoid the traditional cutting bed due to optical transmission problems caused by large attenuation of laser cutting power.
使光路在传导的过程 中损失最小，避免传统裁床由于光路传输问题而造成激光切割功率的大量衰减。
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