Tang Ming-Ying, Sui Shao-Shuai, Yang Yue-De, Xiao Jin-Long, Du Yun, Huang Yong-Zhen
Opt Express. 2015 Oct 19;23(21):27739-50. doi: 10.1364/OE.23.027739.
Mode selection in square resonator semiconductor microlasers is demonstrated by adjusting the width of the output waveguide coupled to the midpoint of one side. The simulation and experimental results reveal that widely tunable single mode lasing can be realized in square resonator microlasers. Through adjusting the width of the output waveguide, the mode interval of the high-Q modes can reach four times of the longitudinal mode interval. Therefore, mode hopping can be efficiently avoided and the lasing wavelength can be tuned continuously by tuning the injection current. For a 17.8-μm-side-length square microlaser with a 1.4-μm-width output waveguide, mode-hopping-free single-mode operation is achieved with a continuous tuning range of 9.2 nm. As a result, the control of the lasing mode is realized for the square microlasers.
通过调整与一侧中点耦合的输出波导的宽度，演示了方形谐振腔半导体微激光器中的模式选择。仿真和实验结果表明，方形谐振腔微激光器可以实现广泛可调的单模激光发射。通过调整输出波导的宽度，高Q模式的模式间隔可以达到纵向模式间隔的四倍。因此，可以有效避免模式跳变，并且通过调整注入电流可以连续调谐激光波长。对于边长为17.8μm、输出波导宽度为1.4μm的方形微激光器，实现了无模式跳变的单模运行，连续调谐范围为9.2nm。结果，实现了对方形微激光器激光模式的控制。
