“…Usually, those errors are easier to correct for a high repetition difference as the higher repetition difference corresponds to a higher tracking speed. In this work, by using a mechanically robust prototype implementation of spatial multiplexing, we are able to satisfy the condition for coherent averaging at <1 kHz Δ f rep . To compensate for the relative timing jitter and relative phase shift in the measurement arm, we built a reference arm to monitor those parameters and then correct them for the measurement arm.…”