Abstract

Multi longitudinal mode oscillation in a semiconductor quantum dot (QD) laser caused by spatial hole burning is studied. The number of modes is shown to remain limited with increasing injection current. The maximum number of longitudinal modes that can simultaneously oscillate in a laser cavity is analytically estimated. While this number increases with increasing surface density of QDs or cavity length, it remains limited with varying uniformity of the QD ensemble. The critical tolerable values of the structure parameters are derived beyond which higher-order longitudinal modes can not oscillate. The threshold current and output power of each mode are calculated numerically using the finite difference method. Spatial hole burning is shown to reduce the total output power; the effect is more significant when any of the structure parameters approaches its critical value.

 

Biography

Li Jiang received his B.S. degree in Physics from Peking University in 2001 and M.S. degree in Microelectronics and Solid-State-Electronics from the Institute of Semiconductors of the Chinese Academy of Sciences in 2004. He is currently pursuing his Ph.D. degree under the direction of Prof. Asryan. His work focuses on the theory of semiconductor quantum dot lasers.