Is it possible to see fiber laser cavity modes in CW lasing mode by a radiospecrometer ? If I have a laser CW output can RF spectrometer to show a laser cavity frequencies ? As I think a CW output RF spectrum has to be consist of a cavity frequencies .
Arkadiy, You are right, registration of beating in radiofrequency spectra is best method to study the mode spectra of CW laser and this method has been applied successfully for HeNe laser already in 70th years of past millennium. Your radio spectral analyser has to be tuned approximately on beating of longitudinal and transverse modes and lasing must be as far as possible frequency stable to have plain results.
Can you take a mean of your RF signal over some time to try to find a some resonant structure, every line of which have to be responded to cavity frequencies ?
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