用于双光梳产生的偏振复用环形腔光纤激光器
Polarisation multiplexing ring-cavity fibre laser for dual-comb generation
AI总结：
本论文开发并表征了一种偏振复用环形腔光纤激光器，用于产生稳定双光梳，实现高精度双梳激光雷达测距，并分析了其动力学特性与恶劣环境下的应对策略。
摘要：
本论文介绍了一种用于双光梳产生的偏振复用环形腔光纤激光器的开发与表征。论文探讨了该创新激光系统的基础物理、实现方式及潜在应用，尤其是在激光雷达（LIDAR）技术中的应用。传统的用于计量学的双频梳系统使用两个通过复杂反馈环路同步的光学频率梳，这些系统存在相位锁定问题，并增加了系统成本和脆弱性。相比之下，单腔双梳系统在同一腔内产生具有略微不同重复率的两个光梳，确保了相互相干性和噪声消除。然而，这些系统通常表现出不稳定的状态，并且通常仅在实验室中演示。本论文旨在设计、构建、表征并优化一种单腔偏振复用光纤激光器，该激光器产生的双光学频率梳具有足够的稳定性和精度，可用于双梳激光雷达。该系统简化了生成过程，同时增强了适用性。次要目标包括分析激光强度动力学，并与一家公司合作解决激光雷达在商业上的需求和挑战，尤其是在恶劣条件下的需求。结果表明，该系统实现了稳定的双梳产生，漂移极小（每小时1赫兹），并可运行超过250小时。该系统在5米模糊距离内实现了亚毫米级精度，基础重复频率（frep）为39.25兆赫兹，重复频率差（Delta frep）为869赫兹。研究结果证实了该体制在高精度测距方面的稳健性，同时也揭示了一些局限性。论文还分析了单腔内的建立和传播动力学，展示了一个两阶段过程，以及初始尖峰能量演化如何影响成功分离。最后，论文为恶劣环境下的激光雷达系统提供了缓解策略。
英文摘要：
This thesis presents the development and characterisation of a polarisation-multiplexing ring-cavity fibre laser for dual-comb generation. It explores the underlying physics, implementation, and potential uses of this innovative laser system, especially in LIDAR technology. Conventional dual-frequency comb systems for metrology use two optical frequency combs synchronised via complex feedback loops, which suffer from phase-locking issues and raise system cost and fragility. In contrast, single-cavity dual comb systems generate two combs with slightly different repetition rates in the same cavity, ensuring mutual coherence and noise cancellation. However, these systems often display unstable regimes and are typically demonstrated only in laboratories. This thesis aims to design, build, characterise, and optimise a single-cavity polarisation multiplexed fibre laser that produces dual optical frequency combs with enough stability and precision for dual-comb LIDAR. The system simplifies generation while enhancing applicability. Secondary goals include analysing the laser intensity dynamics and collaborating with a company to address commercial needs and challenges in LIDAR, particularly under harsh conditions. Results show stable dual-comb generation with minimal drift (1 Hz per hour) and operation over 250 hours. The system achieves sub-millimetre precision in 5-metre ambiguity ranges with a fundamental frep of 39.25 MHz and Delta frep of 869 Hz. The findings confirm the regime's robustness for high-precision ranging while exposing some limits. The thesis also analyses build-up and propagation dynamics in a single cavity, showing a two-stage process and how initial spike energy evolution affects successful separation. Finally, it offers mitigation strategies for LIDAR systems in harsh environments.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
