Gain Measurement and Anomalous Decrease of Peak Gain at Long Wavelength for InAs/GaAs Quantum-Dot Lasers  

作　　者：肖金龙 黄永箴 杜云 赵欢 倪海桥 牛智川 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 [2]National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083

出　　处：《Chinese Physics Letters》2007年第10期2984-2986,共3页中国物理快报（英文版）

基　　金：Supported by the National High Technology Development Program of China under Grant No 2003AA311070, and the National Natural Science Foundation of China under Grants Nos 60225011 and 60625405.

摘　　要：Mode gain spectrum is measured by the Fourier series expansion method for InAs/GaAs quantum-dot （QD） lasers with seven stacks of QDs at different injection currents. Gain spectra with distinctive peaks are observed at the short and long wavelengths of about 1210nm and 1300nm. For a QD laser with the cavity length of 1060μm, the peak gain of the long wavelength first increases slowly or even decreases with the injection current as the peak gain of the short wavelength increases quickly, and finally increases quickly before approaching the saturated values as the injection current further increases.Mode gain spectrum is measured by the Fourier series expansion method for InAs/GaAs quantum-dot （QD） lasers with seven stacks of QDs at different injection currents. Gain spectra with distinctive peaks are observed at the short and long wavelengths of about 1210nm and 1300nm. For a QD laser with the cavity length of 1060μm, the peak gain of the long wavelength first increases slowly or even decreases with the injection current as the peak gain of the short wavelength increases quickly, and finally increases quickly before approaching the saturated values as the injection current further increases.

关 键 词：LINEWIDTH ENHANCEMENT FACTOR OPTICAL-MODE LOSS SEMICONDUCTOR-LASERS 

分 类 号：O43[机械工程—光学工程]