高精度星载计量系统的数字laser频率控制和相位稳定回路
Digital laser frequency control and phase stabilization loops for a high precision space-borne metrology system
摘要：
我们报告的设计，实施和表征的全数字控制回路的激光频率稳定，差分锁相和性能优化的光学计量系统上的LISA探路者空间任务。该光学计量系统由一个带调制器的激光器、四个马赫-曾德尔干涉仪、一个相位计和一个用于数据分析的数字处理单元组成。数字环路设计的优点是控制器实现和环路校准简单灵活，锁定和复位自动灵活，性能优于模拟电路。利用我们系统的实际能力来调制激光频率，使我们能够准确地确定开环传递函数和其他系统特性。各种噪声源及其对系统性能的影响进行了详细研究。
英文摘要：
We report on the design, implementation and characterization of fully digital control loops for laser frequency stabilization, differential phase-locking and performance optimization of the optical metrology system on-board the LISA Pathfinder space mission. The optical metrology system consists of a laser with modulator, four Mach-Zehnder interferometers, a phase-meter and a digital processing unit for data analysis. The digital loop design has the advantage of easy and flexible controller implementation and loop calibration, automated and flexible locking and resetting, and improved performance over analogue circuitry. Using the practical ability of our system to modulate the laser frequency allows us to accurately determine the open loop transfer function and other system properties. Various noise sources and their impact on system performance are investigated in detail.
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