LIGO Document T1900048-v1

LHO Squeezer Control Scheme Summary

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T - Technical notes
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There are two control schemes that have been proposed and tested to lock the phase of the squeezed light to the interferometer. One scheme uses the PSL reference cavity as a reference for the squeezed light and the other uses the VOPO as the reference cavity for the squeezed light. We will briefly discuss the advantages and disadvantages of each scheme before focusing on the scheme that uses the VOPO as the reference cavity. This note references the alogs and attempts to give some context to the development of the control scheme at LHO
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