In the log post https://logbooks.ifosim.org/iucaa2019/2019/12/21/why-do-we-see-non-zero-common-prc-and-src-length-signals-at-the-michelsons-output-port/ there was uncertainty about where some unexpected common-mode arm motion coupling into the anti-symmetric output was coming from. We’ll focus on the last simulation repeated here: Although it looks like the the model is symmetric there is still an additional 90 degrees of detuning on both ITMX and ETMX. Why […]