Observation of noise phase locking in a single-frequency VECSEL
  We present an experimental observation of phase locking effects in the intensity noise spectrum of a semiconductor laser. These noise correlations are created in the medium by coherent carrier-population oscillations induced by the beatnote between the lasing and non-lasing modes of the laser. This phase locking leads to a modification of the intensity noise profile at around the cavity free-spectral-range value. The noise correlations are evidenced by varying the relative phase shift between the laser mode and the non-lasing adjacent side modes. 
A. El Amili (LAC), V. Pal (JNU), F. Goldfarb (LAC), R. Ghosh (JNU), M.   Alouini (IPR, TRT), I. Sagnes (LPN), and F. Bretena...
physics.optics quant-ph