Weng Dengqun, Liang Yanbo, Qiao Zhongliang, Li Xiang, Sia Jia Xu Brian, Li Zaijin, Li Lin, Chen Hao, Zhao Zhibin, Qu Yi, Liu Guojun, Liu Chongyang, Wang Hong
Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, College of Physics and Eletronic Engineering, Hainan Normal University, Haikou 571158, China.
Hainan International Joint Research Center for Semiconductor Lasers, Hainan Normal University, Haikou 571158, China.
Sensors (Basel). 2024 Dec 11;24(24):7905. doi: 10.3390/s24247905.
We observed tunable characteristics of optical frequency combs (OFCs) generated from InGaAs/GaAs double quantum wells (DQWs) asymmetric waveguide two-section mode-locked lasers (TS-MLLs). This involves an asymmetric waveguide mode-locked semiconductor laser (AWML-SL) operating at a center wavelength of net modal gain of approximately 1.06 µm, which indicates a stable pulse shape, with the power-current(P-I) characteristic curve revealing a small difference between forward and reverse drive currents in the gain region. Under different operating conditions, the laser exhibits the characteristics of OFCs. And the pulse interval in the timing and the peak interval in the frequency domain show a periodic alternating change trend with the increase in the gain current. This tunable characteristic is reported for the first time. The study demonstrates the feasibility of generating tunable optical combs using a monolithic integrated two-section mode-locked semiconductor laser (MI-TS-MLL). This has important reference value for the application of OFCs generated from MI-TS-MLLs or integrated optical chips.
我们观察了由InGaAs/GaAs双量子阱（DQW）非对称波导两段锁模激光器（TS-MLL）产生的光学频率梳（OFC）的可调谐特性。这涉及到一个工作在净模态增益中心波长约为1.06 µm的非对称波导锁模半导体激光器（AWML-SL），这表明脉冲形状稳定，其功率-电流（P-I）特性曲线显示在增益区域正向和反向驱动电流之间存在微小差异。在不同的工作条件下，该激光器呈现出光学频率梳的特性。并且随着增益电流的增加，时间上的脉冲间隔和频域上的峰值间隔呈现出周期性交替变化趋势。这种可调谐特性是首次被报道。该研究证明了使用单片集成两段锁模半导体激光器（MI-TS-MLL）产生可调谐光学频率梳的可行性。这对于由MI-TS-MLL或集成光学芯片产生的光学频率梳的应用具有重要的参考价值。
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