Why do we see non-zero common, PRC and SRC length signals at the Michelson’s output port?

Question The “Degrees of freedom transfer functions” task in notebook 14 involves applying signals to the cavity mirrors or the power recycling or signal recycling mirror to modulate the differential arm, common arm, power recycling and signal recycling cavity lengths, respectively. We look at a photodetector at the output port of the interferometer, which is […]

Difference in transfer functions of modulation of space and modulation of mirrors

Question: In reference to Task 1, for sheet 13, the above plot is in relation to modulating the space of the cavities, i.e., changing the length of both the cavities. The plot below is modulating the position of the mirror. What is the reason for the difference between the two plots? Theoretically, both the processes […]