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首次提出并实现了一种利用笼式共轴系统搭建的Littman结构平移透镜外腔半导体激光器。通过微调节架驱动准直透镜平移从而改变光栅表面的激光入射角,可以实现约8.5 nm的连续波长调谐,准直透镜平移1μm波长改变约0.02 nm,实验测量值与理论计算值能够很好地吻合。通过压电陶瓷驱动准直透镜平移,研究了Littman结构平移透镜外腔半导体激光器的跳模特性并定性分析了发生跳模的基本原理。此外,该外腔系统的出射激光具有优异的单模特性和稳定性,室温下工作电流为300 m A时单模输出功率超过18 m W。
For the first time, Littman structure-based translating lens external cavity semiconductor lasers constructed with cage coaxial system are proposed and implemented. The tunable lens is tunable by fine-tuning the collimator lens to change the laser incident angle of the grating surface. The continuous wavelength tuning of about 8.5 nm can be realized. The collimation lens is shifted by about 0.02 nm when the wavelength is shifted by 1 μm. The experimental measurement and the theoretical calculation can well Anastomosis. Through the translational movement of the collimating lens driven by piezoceramic, the jump mode characteristics of the Littman-structure translating lens external cavity semiconductor laser are studied and the basic principle of jump mode is qualitatively analyzed. In addition, the exit laser of the external cavity system has excellent single-mode characteristics and stability, and the single-mode output power exceeds 18 mW at an operating current of 300 mA at room temperature.