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；

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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。

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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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