低振动敏感性的法布里-珀罗腔设计

Design of Fabry-Pérot Cavity with Low Vibration Sensitivity

铝离子光钟跃迁谱线的自然线宽为8 mHz,因此,需要用线宽为1 Hz左右的激光探测光钟跃迁谱线。半导体激光器的线宽为500 kHz,长期漂移量为90 MHz/h,为了满足铝离子光谱探测的要求,将激光频率稳定在法布里-珀罗(F-P)腔上。振动噪声为F-P腔的主要噪声之一,为了降低F-P腔的振动敏感性,理论分析了激光频率稳定的F-P腔振动敏感性。通过有限元方法模拟分析了F-P腔的弹性形变与其形状和支撑位置的关系,设计了激光波长为534 nm时激光振动敏感性为0.53 kHz/(m?s^(2))的F-P腔,为实现低振动噪声激光提供了理论依据,在原子钟和精密谱测量领域具有重要的应用价值。

Aluminum ion optical clock transition has a natural linewidth of 8 mHz.The detection laser’s linewidth must be ~1 Hz to obtain the optical clock transition spectral line.The semiconductor laser has a linewidth of 500 kHz and a long-term drift of 90 MHz/h.The laser frequency is locked on the Fabry-Pérot(F-P) cavity to meet the requirements of aluminum ion spectral detection.One of the main noises of the F-P cavity is vibration noise.To reduce the vibration sensitivity of the F-P cavity,this study theoretically analyzes the vibration sensitivity of the F-P cavity with stable laser frequency.The finite element method is used to investigate the relationships between the elastic deformation of the F-P cavity as well as its shape and support position.An F-P cavity is designed with a laser vibration sensitivity of0.53 kHz/(m·s~2) at a laser wavelength of 534 nm.It provides a theoretical foundation for realizing low vibration noise lasers and has important applications in the fields of atomic clocks and precise spectrum measurement.