Recording the interference fringe produced from two coherent light beams by use of photoresist is a key process in manufacturing a holographic grating.

由光致刻蚀剂记录两束相干光干涉条纹是制作全息光栅的关键步骤。

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The intensity of the coherent light builds up very rapidly.

相干光的强度迅速地增大。

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Light that is of one frequency, with the waves in step is called coherent light.

单频率且波同步的光叫相干光。

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This generates the coherent light of a laser beam in the core of a long, thin optical fibre.

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That happens because, provided those electrons that have given off light are quickly pumped back to their excited states, the light bouncing around between the mirrors will stimulate the production of yet more light and a powerful, coherent beam will emerge.

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What makes a laser so useful is that it is extremely neat, clean and sharp--the light is all the save wavelength and it is said to be coherent.

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