Research on high-reliability PDH frequency stabilization technology against environmental interference

In recent years, frequency-stabilized laser technology has been widely applied in cutting-edge fields such as space gravitational wave detection, quantum precision measurement, and atomic clocks, promoting the rapid development of precision frequency-stabilized technology. Due to the problem of insufficient universality of frequency stabilization techniques such as saturated absorption spectroscopy, which are limited by specific laser wavelengths, the Pound-Drever Hall (PDH) frequency stabilization technology has gradually developed into a core frequency stabilization method that combines wide applicability and high precision by taking the resonant frequency of the optical resonator as the frequency - reference, breaking through the wavelength dependence limitation. However, traditional PDH technology still faces technical bottlenecks such as limited linear dynamic range, insufficient environmental immunity, and a relatively high probability of lock loss in complex environments. According to the above problem, this study system combed the PDH theoretical framework of frequency stabilization technology and optimization path: Firstly, based on the basic resonance principle of the Fabry-Perot cavity and the theoretical derivation of error signal generation, a brief overview of the influencing factors of PDH frequency stabilization technology is made. Finally, focusing on the technological innovation directions in the past five years, from (1) frequency discrimination signal optimization processing, and (2) residual amplitude noise (RAM) suppression strategy, And (3) The integration of an intelligent frequency stabilization system based on an embedded development platform from three dimensions comprehensively reviews the key methods for enhancing the robustness and practicality of PDH technology.