当光纤长度较短时，在输出端放置反射镜使泵浦光高反射，可以提高输出功率和效率。

For short fiber, the output laser power and slope efficiency can be improved when a reflective mirror is set at output end to reflect the pump light.

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光谱选择性吸收涂层是一种具有对可见-近红外光高吸收、对红外光高反射的特种涂层。

Spectral selective absorbing coating is a kind of special coating with high absorptance in vis-near infrared wavelength and high reflectance in infrared wavelength.

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选择全部方块，然后使用不透明度20%的软画笔在上面涂抹一些高光。

Select all of them, then with a 20% Opacity, soft brush, paint some highlights on them.

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So, what we would expect is that there is a relationship between intensity in kinetic energy because it was understood that however intense the light was, if you had a more intense light, it was a higher energy light beam.

光强和能量之间,应该有一定的关系,因为在我们的理解中,不管光强是多少，光的强度越大,光束能量越高。

麻省理工公开课 - 化学原理课程节选

So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选