Diffractive beam-multiplication elements split a laser beam into several beams, each with the characteristics of the original beam except for power and angle of propagation. Focusing multi-spot elements provide a line or an array of identical focal spots located in the focal plane, with spacing between neighboring spots.
用于将激光光束分成一维或者二维的光束分束器（光束分束镜），每束光除了功率和传播角度与原有光束不同外，其余光学特性都与原光束保持不变。
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