Dynamics and pulse-package oscillations in broad-area semiconductor lasers with short optical feedback

Pulse-package oscillations in broad-area semiconductor lasers subjected to short optical feedback are experimentally observed. The pulse-package oscillation consists of a frequency component that corresponds to an external optical feedback loop with an envelop of periodic low-frequency fluctuations. However, the periodicity induced by optical feedback does not always improve the time-averaged beam profiles of the laser oscillations. We also investigated time-averaged near-field beam profiles in relation with the optical feedback dynamics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769181]