I am working on an optical setup monitoring the power output of a 633nm 1.2mW laser. The light is polarised before entering a polarisation maintaining optical fibre in a thorlabs fiber launch clamp. The output is stable before the fibre, but very unstable after the fibre, so I know this is the source. Any suggestions on what might be causing this? Reducing the draft in the room and turning off the lights does not seem to be working. I am also using an optical bench with pneumatic isolators.
Any advice would be appreciated, thanks.
Dear Thomas Knight ,
vibration isolation via your optical bench may not be effective enough; so one measure may be to support your fiber over the whole length in order to prevent hanging freely in your set up and fix it by tape or children's play dough at various positions...
Good luck and
best regards
G.M.
Do you align the polarization of the laser to the axis of the fiber? It is absolutely necessary to align it to within a few degrees to avoid beating between the two output polarization modes.
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