摘要
针对目前普遍采用的功率平衡法实现热稳频的纵向塞曼激光器存在的稳频控制点偏移问题,建立了左右旋圆偏振光光功率差调谐曲线零点与稳频控制点之间频率偏移量的数学模型,提出了稳频控制点偏移的修正方法。该方法通过对左右旋圆偏振光的精确偏振分光和对称功率检测来抑制稳频控制点偏移的随机扰动分量,同时补偿其相对稳定偏置分量,可有效降低稳频控制点偏移引起的激光频率漂移。实验表明,基于稳频点偏移修正方法构建的纵向塞曼热稳频系统,在2h40min内输出光频率相对变化小于4×10-9,阿伦方差频率稳定度为1.9×10-10(采样时间1000s),在24h的重复实验中系统输出光中心频率漂移小于1.3×10-9。故该方法可有效抑制激光器稳频控制点漂移,提高激光频率稳定度。
In order to study the lock point offset in the longitudinal Zeeman-stabilized laser,we establish the mathematic model for the offset between the lock point and the power-balanced point of the two oppositely drcularly polarized beams outputted from the longitudinal Zeeman laser,and propose a new frequency stabilization method based on the lock point offset correction. In the proposed method, the random elements of the lock point offset are greatly suppressed by dividing the two circularly polarized beams efficiently and detecting the beam power precisely, while the relatively stable elements are compensated in real time,and the beam frequency is effectively stabilized. Experiments show that,for the longitudinal Zeeman-stabilized laser based on lock point offset correction,the peak-to-peak range of the beam frequency is 2MHz （4 × 10^-9 ） during 2.4 hours,and the average beam frequency drifts by less than 0.6 MHz （1.3 × 10^-9 ） in 24 hours,and the root Allan vafiance is 1.9× 10^-10 （sample time 1000 s）. It comes to the conclusion that the proposed method can depress beam frequency drift of the longitudinal Zeeman-stabilized laser.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2008年第1期46-49,53,共5页
Journal of Optoelectronics·Laser
