Science 256,281-412, 17 April 92
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For each interferometer, the laser beam is conditioned in an input optics chain before it reaches the beam splitter.
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After passing through the beam splitter, the beams enter the chambers containing the test masses, where they are directed into 2-km or 4-km interferometer cavity.
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After leaving the cavity, the beams, now back in the test mass chamber, are directed back to the beam splitter and then into an output optics chain that terminates with the photodetector.
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At site 1, all elements of the 4-km interferometer lie along the two arms,
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whereas the beam splitter and input and output optics chains for the 2-km interferometer lie between the two arms.
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