微腔自注入反馈技术是当前最有希望实现集成化超窄线宽稳频中红外半导体激光器的方案之一，在气体痕量检测、空间光通信、激光雷达探测和军事光电对抗领域具有广泛的应用前景。然而，中红外波段瑞利散射降低和微腔热力学波动噪声限制了激光线宽及频率稳定性的进一步提升，成为其在超长相干精密测量领域应用的难题。为解决上述难题，本项目提出超窄线宽稳频GaSb基半导体外腔激光器研究。通过项目的开展，揭示Bogatov非对称相互作用对自注入反馈GaSb基激光动力学的影响机理；利用非均匀波导结构，抑制腔内横向声模、增强共振瑞利散射，从而实现高效率的线宽压窄和频率锁定；通过螺旋线型微腔实现腔内模式体积最大化，抑制微腔热学波动噪声，提高参考外腔频率稳定性。最终实现超窄线宽稳频GaSb基激光器，为我国新一代微型化、高精度、集成一体化中红外深空探测奠定研究基础。

The technology of self-injection locking to a microcavity is one of the most promising schemes to realize integrated ultra-narrow linewidth stabilized mid-infrared semiconductor lasers. It has a wide application prospect in gas trace detection, space optical communication, Lidar detection and military photoelectric countermeasures. However, the reduction of Rayleigh scattering at longer wavelengths and thermal instability in microcavity limit the further improvement of laser linewidth and frequency stabilization, which becomes a problem in application of ultra-long coherent precision measurement. In order to solve the above problems, this project proposes the ultra-narrow linewidth stabilized GaSb-based external cavity diode laser. In this project, the influence of Bogatov asymmetric interaction on the self-injection locking dynamics for GaSb-based lasers will be revealed. The non-uniform waveguide structure is used for suppressing the transverse acoustic mode and enhancing the resonant Rayleigh scattering, so as to achieve the high efficiency of linewidth compression and frequency locking. The thermal fluctuation noise of the microcavity is suppressed by maximizing the mode volume of helical microcavity, thus result in improving the frequency stability of the reference external cavity. Eventually, ultra-narrow linewidth stabilized GaSb-based external cavity diode laser can be realized, which lays a research foundation for China's new generation of miniaturized, high-precision and integrated mid-infrared deep space exploration.