The Key Laboratory of Space Laser Information Transmission and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made progress in the research of fiber laser frequency noise suppression, and successfully suppressed the low frequency noise of single frequency fiber laser to Thermal noise limit.

According to news from the Chinese Academy of Sciences, this technology is expected to overcome the complex and expensive limitations of traditional laser frequency stabilization technology, and effectively promote low-noise single-frequency fiber lasers from the laboratory environment to industrial applications such as lidar and fiber sensing.

According to reports, the research team achieved fine control of the thermo-optic effect in the cavity by controlling the equivalent thermal expansion coefficient of the fiber laser resonator cavity, and built a self-feedback mechanism for the laser frequency inside the laser cavity. Through theoretical derivation and experimental research, 20dB fiber laser low frequency noise suppression and thermal noise limit fiber laser output are achieved.

In addition, the research also conducted a comprehensive research and test on the fiber laser intensity noise and environmental robustness under the self-feedback mechanism, confirming the advanced nature of the technology. This research is expected to effectively promote the application of single-frequency fiber lasers in related industrial fields such as lidar and fiber sensing.

Currently, related research papers are published in “Optics Letters”. The research work is supported by the National Natural Science Foundation of China, the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences, and the Shanghai Sailing Talents Program.