I am not sure whether this is the correct place to ask, otherwise, please point me to the appropriate platform. I have been reading about fibre optic interferometric sensors and notice that most people use an optical spectrum analyzer (OSA) as the detector.
Therefore, I am wondering if it is possible to use a spectrometer (i.e. Ocean Optics USB4000) to observe the interference pattern in the form of a comb-like spectrum or with multiple dips.
I've tried using a 650 nm laser as the source but the spectrum appears very smooth with the peak at the corresponding wavelength. However, I am not sure whether it is due to my current setup or because the Ocean Optics USB4000 spectrometer cannot detect interference pattern.
An additional note: the entrance slit of my spectrometer is broken so I am also wondering if that is the cause.