Quantum Dot Materials Toward High-Speed and Ultrafast Laser Applications

Abstract

Self-assembled In(Ga)As/GaAs quantum dots (QDs) have attracted much attention for both high-speed and ultrafast laser applications because of their fascinating optical and electronic properties. Here, we will review recent development of InAs/GaAs quantum dots and their applications to high-speed lasers and ultrafast lasers. The chapter includes two main sections, one is focusing on developing high-quality 1310 nm InAs/GaAs quantum dot structures and fabricating high-performance lasers including ultrashort cavity Fabry-Perot (F-P) and distributed feedback (DFB) lasers. We will discuss effects of the modulation p-doping on optical properties of 1310 nm InAs/GaAs QDs and share our latest results on ultrashort cavity F-P and DFB lasers. The other is about the recent works on the development of 1550 nm InAs/GaAs quantum dot semiconductor saturable absorber mirrors (QD-SESAMs) and the realization of a high repetition rate diode-pumped solid-state and Q-switched Er-doped fiber laser mode-locked by the utilization of 1550 nm QD-SESAM.