A beam splitter apparatus including demultiplexing portions that split an input pulsed light beam into a plurality of optical paths; relay optical systems that individually relay the pulsed light beams in the plurality of optical paths; a multiplexing portion that multiplexes the plurality of pulsed light beams that have been relayed through the optical paths; and delaying portions and divergence-angle setting portions that respectively give the pulsed light beams, which are individually guided through the plurality of optical paths, relative time delays that are large enough to separate the signal lights and divergence angles that are different from each other.
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