Robust laser frequency stabilization by serrodyne modulation
  We report the relative frequency stabilization of a distributed feedback erbium-doped fiber laser on an optical cavity by serrodyne frequency shifting. A correction bandwidth of 2.3 MHz and a dynamic range of 220 MHz are achieved, which leads to a strong robustness against large disturbances up to high frequencies. We demonstrate that serrodyne frequency shifting reaches a higher correction bandwidth and lower relative frequency noise level compared to a standard acousto-optical modulator based scheme. Our results allow to consider promising applications in the absolute frequency stabilization of lasers on optical cavities. 
Ralf Kohlhaas (LCFIO), Thomas Vanderbruggen (LCFIO), Simon Bernon   (LCFIO), Andrea Bertoldi (LCFIO), Arnaud Landragin (SYRT...
physics.optics physics.atom-ph