Shanghai Institute of Optics and Mechanics has made progress in fiber laser noise suppression research

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[ Instrument network instrument research and development ] Recently, the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences Key Laboratory of Space Laser Information Transmission and Detection Technology of the Chinese Academy of Sciences has made progress in the research of fiber laser frequency noise suppression. Based on the negative feedback effect of intracavity optical The low frequency noise of the fiber laser is suppressed to the thermal noise limit. 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. Related research papers are published in "Optics Express" (Opt.Express).
In recent years, with the rapid development of laser frequency stabilization technology, low-noise single-frequency fiber lasers are widely used in scientific and technological fields such as optical atomic clocks and gravitational wave detection. However, the current commonly used high-precision frequency stabilization technology requires expensive, large-volume high-stability cavity, absorption cell, etc. as frequency reference, and through complex electrical/optical feedback technology, it limits its use in optical fiber sensing, lidar, etc. Industrial applications. Therefore, the research on low-cost and high-robust fiber laser noise suppression technology is of great significance.
By controlling the equivalent thermal expansion coefficient of the fiber laser cavity, the research team realized the fine regulation of the thermo-optic effect in the 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 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.
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 (Class B), and the Shanghai Yangfan Talent Program.

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