论文部分内容阅读
针对目前热稳频激光器抗干扰能力差的问题,研制了一种基于非对称热结构的激光热稳频系统。该系统采用不同热传导材料建立具有多个连续热传导层的热结构,其中电热控制层和干扰吸收层被有限导热层隔离并呈不对称的热传导特性。由于有限导热层的隔离作用,电热控制和环境干扰对激光管的热作用速度分别取决于电热控制层和干扰吸收层的热惯性大小。结构参数设计中使电热控制层的热惯性远小于干扰吸收层,则可在保证电热控制效率的同时降低环境干扰的作用速度,从而提高稳频系统的抗干扰性能。最后,建立基于非对称热结构的纵向塞曼激光热稳频系统,对其抗干扰特性进行验证。实验结果表明:在普通实验室条件下稳频系统的频率稳定度优于1.8×10-10,而在1m/s的持续气流扰动下其频率波动<1.5×10-9。
Aiming at the problem of poor anti-jamming performance of current heat stabilized laser, a laser thermal stabilization system based on asymmetric thermal structure is developed. The system uses different heat-conducting materials to create a thermal structure with multiple continuous heat-conducting layers, wherein the heat-controlling layer and the interference-absorbing layer are separated by a finite heat-conducting layer and have an asymmetric thermal conductivity. Due to the isolation of the finite thermal conductivity layer, the thermal effects of the thermal control and environmental interference on the laser tube depend on the thermal inertia of the thermal control layer and the interference absorption layer, respectively. The thermal inertia of the heating control layer in the design of the structure parameters is much smaller than that of the interference absorption layer, so that the effect of the environmental interference can be reduced while the efficiency of the electric heating control is ensured, thereby improving the anti-interference performance of the frequency stabilization system. Finally, a longitudinal Zeeman laser thermal stabilization system based on asymmetric thermal structure is established to verify the anti-interference characteristics. The experimental results show that the frequency stability of the frequency stabilization system is better than 1.8 × 10-10 under normal laboratory conditions, while the frequency fluctuation is less than 1.5 × 10-9 under 1m / s continuous airflow disturbance.