波长和重复频率可调谐外腔锁模量子点激光器

External-cavity mode-locked quantum dot lasers with tunable wavelength and repetition rate in the 1.0-1.3 micron band will be studied in this project. Here, intrinsical non-uniformity of size distribution of the self-assembled quantum dots is used to enhancing the bandwidth of the optical gain spectrum. Further more, ultrafast carrier dynamics in quantum dot materials is very suitable for the generation of ultra-short mode-locked pulses. External-cavity mode-locked quantum dot lasers are advantageous both for the wavelength tuning and the repetition rate tuning. In the project, growth of self-assembled quantum dots, optical and structural properties of quantum dot materials, fabrication and characterization of quantum dot gain devices, and construction of external-cavity mode-locked lasers with tunable wavelength and repetition rate, will be studied comprehensively and systemically.

本项目利用自组织量子点材料尺寸非均匀导致的光增益谱展宽以及量子点超快的载流子动力学特征，发挥外腔锁模激光器波长和重复频率均可方便调谐的优势，研制1.0－1.3微米波段的波长和重复频率均可调谐的外腔锁模量子点激光器。项目对包括宽增益谱量子点材料的分子束外延生长、材料结构和光学性质、宽增益谱器件研制及性质、波长和重复频率可调谐外腔锁模激光系统的构建、以及激光器性能表征在内的所有环节进行系统的研究。

本项目利用自组织量子点材料尺寸非均匀导致的光增益谱展宽以及量子点超快的载流子动力学特征，发挥外腔锁模激光器波长和重复频率均可方便调谐的优势，波长和重复频率均可调谐的外腔锁模量子点激光器。项目对包括宽增益谱量子点材料的分子束外延生长、材料结构和光学性质、宽增益谱器件研制及性质、波长和重复频率可调谐外腔锁模激光系统的构建、以及激光器性能表征在内的所有环节进行了系统的研究。截至项目结题，外腔锁模量子点激光器指标为：工作波段位于1.0－1.3微米范围内，最大波长调谐带宽达到85.4 nm（调谐范围1130.6-1216.0 nm），重复频率最大调谐范围55.7 MHz-2.2 GHz，最小脉冲宽度为8 ps，外腔锁模量子点激光器的最大平均输出功率大于20 mW。总体来说，该项目全面完成了预定的器件指标和研究目标。