1 中国科学院合肥物质科学研究院安徽光学精密机械研究所，光子器件与材料安徽省重点实验室，安徽 合肥 230031
2 先进激光技术安徽省实验室，安徽 合肥 230037
3 国防科技大学脉冲功率激光技术国家重点实验室，安徽 合肥 230037
4 中国科学技术大学环境科学与光电技术学院，安徽 合肥 230026
本文报道了一种可满足室外应用的具有重复频率锁定功能的皮秒脉冲光纤激光器。通过选用Figure-9光纤激光器结构，并通过优化腔结构来调控非线性，确保了激光器的快速锁模自启动功能；采用低导热材料绝热封装创建“恒温”微环境，松弛了室外环境下锁定重复频率对PZT频率调谐执行器件调谐量的要求。以此为基础，设计并研制了质量仅为3 kg的10 MHz、20 ps锁模光纤激光器样机。在室温、极端温度（-40 ℃或50 ℃）和振动（加速度为1.5g）环境下，该激光器样机都能保持快速锁模自启动和重复频率锁定功能；在室外环境下，该激光器样机的重复频率锁定功能可抵御夏季高温环境下的10 ℃温度波动。
激光器 锁模激光 皮秒脉冲 重复频率锁定 环境温度
Author Affiliations
Abstract
1 MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
2 State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei 230037, China
The generation of an autofocusing circular Airy beam (CAB) is realized via a liquid crystal (LC) geometric phase plate with a simple configuration. The fabrication of the LC plate is based on the photoalignment technology and dynamic exposure skill. A focal length of 74 cm is obtained, and the propagation dynamics are consistent with the simulations. Besides, a defocusing CAB is also generated, and the switch between the autofocusing and defocusing CABs can be achieved by controlling the input polarization state. This work provides a convenient and flexible approach to acquire CABs, which will promote the CAB-related applications and researches.
circular Airy beam autofocusing liquid crystal photoalignment technique Chinese Optics Letters
2020, 18(8): 080008
