InAs量子点双区共腔双稳激光器

本文介绍了一种新型的双区结构的InAs量子点激光器,实现了波长1.24μm室温连续激射,同时在对可饱和吸收区施加反向偏压或开路的条件下观察到了明显的光学双稳现象,其回滞宽度优于已知所报道的结果。此外,还发现减小反向偏压或增大吸收区长度能有效增加回滞宽度。应用一个改进的阈值电流模型,揭示了可饱和吸收区内量子点吸收和电吸收两种机制对光学双稳的影响,并对所观察到的实验结果进行了解释。     

单片集成锁模量子点激光器

首先简要回顾了超短脉冲激光器(LD)的发展史,以及以半导体量子点为有源区的锁模量子点LD的提出及其潜在的、重要应用前景。随后介绍了锁模量子点LD的工作原理、各种锁模方式及其器件结构,进而讨论了量子点作为锁模LD有源区材料所具有的独特优势。最后在介绍锁模量子点激光器已取得的主要研究成果和发展趋势的同时,指出要获得高重复频率、高功率的锁模量子点激光飞秒脉冲,还须进一步对量子点有源区、器件结构和锁模偏置条件等要素进行优化。     

Optical bistability in a two-section InAs quantum-dot laser

Room temperature,continuous-wave bistable operation is achieved in two-section 1.24μm InAs quantum-dot (QD) lasers with integrated intracavity QD saturable absorbers(SA).It is found that the hysteresis width is narrowed with increasing reverse bias voltage,and broadened with increasing length of saturable absorber.This can be explained by the competition between QD absorption and electroabsorption in the SA section.In addition,a larger hysteresis width is realized than other reports so far,which can be a...