I'm trying to select a photodetector for an interferometry experiment. The interferometer will be trying to measure subtle vibrations occurring at a relatively high frequency (high kHz to low MHz). It will be using a visible-wavelength laser. I've read the Thorlabs photodiode tutorial, but I'm still unsure of how to select the photodetector. Specifically, what parameters should I be focusing on, and in what priority, to maximise the performance of such an interferometer?

I'm trying to select a photodetector for an interferometry experiment. The interferometer will be trying to measure subtle vibrations occurring at a relatively high frequency (high kHz to low MHz). It will be using a CW visible-wavelength laser with relatively low power (<50mW). I've read the Thorlabs photodiode tutorial, but I'm still unsure of how to select the photodetector. Specifically, what parameters should I be focusing on, and in what priority, to maximise the performance of such an interferometer?