Frequency modulated laser beam with highly efficient intensity   stabilisation
  We analyse the limitation of the amplitude modulation rejection due to the spatial modulation of the output beam of an acousto-optic modulator used in an active laser beam stabilisation system when a frequency modulation of a few megahertz is applied to this modulator. We show how to overcome this problem, using a single mode optical fibre at the output of the modulator. A residual amplitude modulation of 10-5 is achieved. 
Fr\'ed\'eric Du Burck (LPL), Assia Tabet (LPL), Olivier Lopez (LPL)