温度自适应双光梳重频数字锁定方案OA

As dual-comb technology expands beyond the laboratory,its stable operation in complex temperature environments is increasingly critical.Traditional systems lock the repetition rate to a fixed reference;however,outdoor temperature fluctuations induce thermal effects in the laser cavity,causing continuous frequency drift.With a fixed reference,the phase-locked loop(PLL)must output large compensations,easily exceeding its range and causing the system to unlock.Moreover,traditional temperature controls lack the response speed needed for harsh environments.To address this,we propose a temperature-control-free digital phase-locking scheme based on variable reference frequency compensation.By locking the repetition rate to a reference that is dynamically adjusted in real-time based on loop feedback,this method suppresses temperature-induced drift over a wide range and prevents feedback saturation and unlocking.Experimental results demonstrate stable operation across a 20～40℃range,achieving 8 days of continuous,phase-slip-free locking.The relative frequency stability reaches the 10-12 level at 1 second and the 10-17 level daily,offering a novel solution for the long-term stable operation of dual-comb systems in complex thermal environments.