Laser intensity noise suppression for space-borne gravitational wave mission

作者：Fan Li, Xin Shang, Zhenglei Ma, jiawei wang, Long Tian, Shaoping Shi, Wangbao Yin, Yuhang Li, Yajun Wang, Yaohui Zheng · 发表于：Optics Express · 年份：2025 · DOI：10.1364/oe.550808 · 被引用次数：19 · 研究领域：Pulsars and Gravitational Waves Research、Gamma-ray bursts and supernovae、Geophysics and Sensor Technology

Laser intensity noise is a main limitation of measurement and sensing missions represented by gravitational wave detection. We develop a noise decomposition model and design the core elements of the feedback loop based on the analysis results. We construct a fiber amplifier system with ultra-low intensity noise in the 0.1 mHz-1 Hz frequency band by the employment of an optoelectronic feedback loop that is specially designed, achieving a relative intensity noise below 6×10 −5 /Hz@0.1 mHz-1 Hz. By precise control of the temperature, we improve the temperature and mechanical stability of the fiber amplifier chain. Although the differential phase noise violates the LISA requirement in the 1 mHz-50 mHz frequency band, it meets the requirement at all other frequencies within the measurement range. The study provides an experimental basis and technologies for precise measurement and sensing systems at ultra-low frequency.