LIGO Document T0810032-v1

ETM Transmon Pupil Relay

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T - Technical notes
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The ETM Transmon Pupil Relay optical system forms an image of the ETM telescope entrance pupil onto the surface of the ETM Transmon QPD and minimizes the sensitivity of the Transmon QPD on the rotation of the suspended ETM Transmon table with its associated optics. The QPD height to ETM height transfer function is 12 microns/mm. The spot radius at QPD = 0.7 mm. The Requirements on the stabilization of ETM Transmon optical table are: tilt +/- 0.01 deg; lateral displacement 0.1 mm.

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