LIGO Document T1000581-v1

Optical Layout and Parameters for the POP/ALS Beams

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T - Technical notes
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This document describes the optical parameters of the pick-off power recycling (POP) beams and arm length stabilization (ALS) beams as they are extracted for power recycling cavity (PRC) and delivered to ISC. The ALS beams consist of two 532 nm (called green beams) from the two arm cavities injected from the ETMs and combined at the beam splitter (BS). The POP beam provides a sample of the forward going as well as backward going beam traveling in PRC extracted through PR2. This document provides details about the optical parameters and location coordinates of these beams.
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