LIGO Document T1300162-v2

Photon Calibrator: Optical Follower Servo Design Requirements

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T - Technical notes
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This document outlines the requirements needed to design an Optical Follower Servo(OFS) for the aLIGO Photon Calibrator. This servo's purpose is to reduce both sources of displacement noise: the relative power noise (RPN)from the laser and the noise introduced at harmonics of the modulation frequency.
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Notes and Changes:
A pair of additions regarding the requirements and their implementation. Added section and description of test points for transfer function measurements. Included updated plot of RPN for aLIGO Pcal 2W lasers versus corresponding requirement.
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