基于光纤光梳的传递振荡器技术研究

Research on Transfer Oscillator Technology Based on Fiber Optical FrequencyComb

研究了基于光纤飞秒光学频率梳的传递振荡器技术,介绍了其基本原理,设计并搭建传递振荡器系统,实现了主激光器与从激光器光学频率的相干传递,锁定后系统环内拍频信号的s级频率稳定度达5×10^-19量级。搭建了两套传递振荡器系统,将主激光器的光学频率同时传递至两个独立的从激光器,分析了锁定后两个从激光器拍频信号引入系统中的相位噪声。通过提高拍频信号信噪比、优化信号处理过程、减小外部环境干扰等方法,最终两个从激光器得到的环外拍频信号线宽小于30mHz,光学频率传递的s级频率稳定度达1.4×10^-17量级。

Transfer oscillator technology based on femtosecond optical frequency comb is studied,its basic principles are introduced,and the transfer oscillator system is designed and built.The coherent transfer of optical frequency between the master laser and the slave laser is realized.The second-level frequency stability of beat note signal in the system loop reaches the order of 5×10^-19.For further evaluation,two sets of transfer oscillator systems are setup to transmit the optical frequency of the master laser to two independent slave lasers at the same time,and the phase noise introduced into the system by the beat note signal of the two slave lasers after locking is analyzed.By improving the signal-to-noise ratio of the beat note signal,optimizing signal processing,and reducing external environmental interference,the two outer beat note signals obtained from the two slave lasers have a line width of less than 30 mHz and the s-level frequency stability of optical frequency transmission reaches the order of 1.4×10^-17.