The light is emitted by the laser diode and enters a diffraction grating. 激光束從激光二極體中發出，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，被分成一個中間的明亮光束和一些處於旁邊的光束。
滬公網安備 31011502000490號
電信業務許可證編號：滬B2-20190700
