1.5μm波段连续单频光纤激光器的研究进展

Research progress of 1.5μm-band CW single-frequency fiber laser

连续单频光纤激光器在光纤通信、光纤传感、引力波探测、激光雷达、非线性频率转换、光谱学等领域有着广泛的应用前景,发展十分迅速.近20年来,1.5 m波段连续单频光纤激光性能不断提高,如激光线宽从兆赫兹到千赫兹、功率从毫瓦到近百瓦量级,但激光器的噪声抑制、放大线宽展宽、输出功率等仍有待进一步研究.本文回顾了获得1.5μm波段连续单频激光输出的关键技术,总结了本课题组基于磷酸盐玻璃光纤短腔Bragg反射(DBR)结构实现1.5 m波段连续单频光纤激光性能,以及单频激光功率放大的研究进展.

Continuous-wave （CW） single-frequency fiber lasers have been widely used in optical fiber communication systems, optical fiber sensors, gravitational wave detection, laser LIDAR, nonlinear frequency conversion, and spectroscopy. In the past two decades, 1.5 μm-band single-frequency fiber lasers were greatly improved, such as laser linewidth from MHz to kHz, laser power scaling from several milliwatts level to a few hundred watts level. However, the noise suppression, linewidth as well as the output power of the single-frequency fiber laser need further research. This article reviews the key technologies of single-frequency fiber laser, and introduces the output performance and amplified characteristics of our home-made 1.5 μm-band single-frequency fiber laser, based on the DBR cavity constructed by the high-gain Er^3＋/yb^3＋ co-doped phosphate glass fiber.