激光线宽
激光器
材料科学
光学
花招
光电子学
半导体激光器理论
分布式布拉格反射镜
半导体
光子学
法布里-珀罗干涉仪
物理
作者
Jiachen Li,Sigang Yang,Hongwei Chen,Minghua Chen
摘要
We report a compact and robust laser linewidth reduction solution for commercially available distributed feedback (DFB) semiconductor lasers by butt-coupling a high-Q Si3N4 microring reflector to a DFB semiconductor laser. We fabricate the microring reflector on the 80nm-thick high-aspect-ratio Si3N4 waveguide platform. The 3-dB bandwidth and the free spectral range of the fabricated Si3N4 microring reflector are measured to be 50 MHz and 14.13 GHz, respectively, corresponding to a Q factor of over 3.8 million and finesse of 283. In the experiment, the intrinsic linewidth of the hybrid integrated laser is reduced to an ultra-low level of 2.86 Hz. The proposed hertz-linewidth hybrid integrated laser has great potentials in high-speed coherent optical communications systems and high-resolution optical metrology.
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