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Precision phase readout of optical beat note signals is one of the coretechniques required for intersatellite laser interferometry. Future space basedgravitational wave detectors like eLISA require such a readout over a widerange of MHz frequencies, due to orbit induced Doppler shifts, with a precisionin the order of $\mu \textrm{rad}/\sqrt{\textrm{Hz}}$ at frequencies between$0.1\,\textrm{mHz}$ and $1\,\textrm{Hz}$. In this paper, we present phasereadout systems, so-called phasemeters, that are able to achieve suchprecisions and we discuss various means that have been employed to reduce noisein the analogue circuit domain and during digitisation. We also discuss theinfluence of some non-linear noise sources in the analogue domain of suchphasemeters. And finally, we present the performance that was achieved duringtesting of the elegant breadboard model of the LISA phasemeter, that wasdeveloped in the scope of an ESA technology development activity.

Readout for intersatellite laser interferometry: Measuring low frequency phase fluctuations of HF signals with microradian precision