The light is emitted by the laser diode and enters a diffraction grating. 激光束從激光二極管中發(fā)出，射入衍射光柵。
When the laser beam goes through the diffraction grating, it is split up into a central bright beam plus a number of side beams. 當激光束射入衍射光柵后，被分成一個(gè)中間的明亮光束和一些處于旁邊的光束。
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