论文部分内容阅读
980 nm波段的大功率半导体激光器作为抽运源有很重要的应用,但目前该类器件存在光束质量差和谱宽较宽的问题,影响其抽运效率和稳定性。为提高大功率半导体激光器的抽运效率,就要减小其光谱宽度,提升光束质量。而大功率基横模分布反馈激光器(DFB)通过在器件内部引入分布反馈光栅可以实现窄线宽激光的波长稳定输出,并通过优化脊型波导条件来实现基横模模式输出,提升光束质量。测试该器件的光电特性,1000μm腔长器件的阈值电流约为6 m A,斜率效率为0.71 W/A,最大稳定输出功率为130 m W。该激光器的波长随温度漂移系数为0.064 nm/K;对其远场发散角进行测量,得到快轴发散角为34°,慢轴发散角为6.3°。
High power semiconductor lasers in the 980 nm band are very important applications as pumping sources. However, the current devices suffer from poor beam quality and wide spectral width, affecting their pumping efficiency and stability. In order to improve the pumping efficiency of high power semiconductor lasers, it is necessary to reduce the spectral width and improve the beam quality. The DFB feedback laser (DFB) can realize the stable output of narrow linewidth laser by introducing the distributed feedback grating in the device, and can achieve the output of the fundamental transverse mode by optimizing the ridge waveguide condition to improve the beam quality. The device was tested for its photovoltaic characteristics. The 1000μm cavity length device has a threshold current of about 6 m A, a slope efficiency of 0.71 W / A, and a maximum stable output power of 130 mW. The wavelength of the laser with temperature drift coefficient of 0.064 nm / K; measured its far-field divergence angle, get fast axis divergence angle of 34 °, slow axis divergence angle of 6.3 °.