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本文把激光光束的M2因子的概念扩展到了彩色激光光束，并定义彩色激光光束的M2因子为有效波长的加权平均。
The concept of the beam propagation factor M2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength.
相对湿度恒定的假设是重要的，因为大气中的水蒸气是红外波长辐射的另一种有效吸收剂。
The assumption of constant relative humidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelength.
其中每一个亚结构可以捕获的太阳光波长范围都不一样，这保证了每个亚结构都可以有效的将光转化为电能。
Each of the subcells can capture a different wavelength range of light, enabling each subcell to efficiently convert that light into electricity.
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