TY - JOUR TI - Effect of optical feedback to the ground and excited state emission of a passively mode locked quantum dot laser AU - Mesaritakis, C. AU - Simos, C. AU - Simos, H. AU - Mikroulis, S. AU - Krestnikov, I. AU - Roditi, E. AU - Syvridis, D. JO - Applied Physics Letters PY - 2010 VL - 97 TODO - 6 SP - null PB - SN - 0003-6951, 1077-3118 TODO - 10.1063/1.3477955 TODO - Cavity length; Emission properties; Experimental setup; Experimental studies; External cavity; GaAs; Laser operations; Operation regime; Passively mode-locked; Passively mode-locked lasers; Quantum Dot; Variable cavity length, Excited states; Quantum dot lasers; Quantum theory; Semiconductor quantum dots; State feedback, Feedback TODO - We present an experimental study on the effect of optical feedback in both ground and excited emission of a GaAs quantum dot passively mode locked laser. The experimental setup consisted of a long external cavity with variable cavity length and feedback level ranging from -50 to -20dB. The obtained experimental results show dependence of the emission properties on the cavity length regarding both the ground and excited state. In addition a strong tolerance of the laser operation to feedback at the excited state operation regime is observed. © 2010 American Institute of Physics. ER -