{HEAD ~ The quarter wave plate} 828 converts {TAIL ~ the the components} of the composite light beam to clockwise circularly polarized light and counterclockwise circularly polarized light, and the beam expander 829 expands the composite light beam CB4 to have a relatively large diameter 
{ HEAD ~ The quarter wave plate } 828 converts { TAIL ~ the the components } of the composite light beam to clockwise circularly polarized light and counterclockwise circularly polarized light , and the beam expander 829 expands the composite light beam CB4 to have a relatively large diameter
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