中文摘要：

为了获得高性能的量子点外腔激光器（ECL）,利用InAs/GaAs量子点Fabry-Perot（FP）腔激光器研制了光栅外腔可调谐ECL。对InAs/GaAs量子点ECL进行了一系列的性能测试,主要包括单模稳定性测试、单模调谐范围测试、阈值电流密度测试、无跳模连续调谐测试和输出功率测试。在室温条件下获得了24.6nm的连续调谐范围,覆盖波长从999.2nm到1023.8nm,并且实现了波长无跳模连续调谐。在调谐范围内最低阈值电流密度为1525A/cm2,而且在中心波长处获得的单模输出功率为15mW,单模边模抑制比（SMSR）高达35dB。研究结果表明,通过构建光栅外腔可以实现高性能的InAs/GaAs量子点ECL。

英文摘要：

Because broadband tunable external cavity lasers have many advantages,such as frequency stability,low threshold current and tunable wavelength,which are wid ely applied to spectroscopy,biomedicine and optical telecommunication.Due to the dimension of quantum dot lasers is not well distributed with low threshold current and broad gain profile ,the broadband tunable quantum dot lasers are easier to realize.In order to obtain higher performance InAs/GaAs quantum dot external cavity lasers, we have researched a grating external cavity tunable laser based on InAs/GaAs quantum do t （QD） Fabry-Perot （FP） laser diode.We carry on systematical characterizations on In As/GaAs quantum dots external cavity lasers,which mainly include the stability of single-mode lasing,the tuning range of single-mode lasing,the threshold current density,the continuous single-mo de tuning without mode-hoping and the output power measurement.A tuning range of 24.6nm has been achieved at room temperature,cov ering the wavelength from 999.2nm to 1023.8nm,in which hop-free tuni ng has been obtained.The lowest threshold current density is measured as 1525A/cm2and the output power is above 15mW, with side mode suppression ratio above 35dB.The results of research show that high performance InAs/GaAs quantum dot external cavity lasers have been realized.