As an important part of laser interferometry system, optical bench is one of the core technologies for the detection of spaceborne gravitational waves. As the first step of the space Taiji program, Taiji-1 provides the measurement accuracy of laser interferometry system better than 100 pm/Hz1/2(@10 mHz–1 Hz). Taiji-1 is required to be able to track the motion of test mass in inertial sensor. According to the requirements, four interfering optical paths were designed. By adopting an integrated satellite design and selecting the optical and mechanical materials with low linear expansion coefficient, the high stability of optical path was achieved. By using the DOE method, the alignment errors (position/attitude) of four optical paths were all reduced to below 50 μ m/100 μ rad. In the performance test, the accuracy of laser interferometry system was better than 100 pm/Hz1/2(@10 mHz–1 Hz), and the modulation signal of inertial sensor was successfully detected. The results show that all technical indexes of optical bench have met or exceeded the design requirements.

中文翻译：

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光具座在太极一号激光干涉仪上的成功应用

作为激光干涉测量系统的重要组成部分，光具座是星载引力波探测的核心技术之一。作为太空太极计划的第一步，太极一号提供了优于100 pm/Hz的激光干涉测量系统的测量精度1/2（@10 mHz–1 Hz）。Taiji-1 需要能够在惯性传感器中跟踪测试质量的运动。根据要求，设计了4条干涉光路。采用一体化卫星设计，选用线膨胀系数低的光学和机械材料，实现了光路的高稳定性。采用DOE方法，4条光路的对准误差（位置/姿态）均降低到50以下μ米/100μ拉德。在性能测试中，激光干涉测量系统的精度优于100 pm/Hz1/2(@10 mHz–1 Hz)，并成功检测到惯性传感器的调制信号。结果表明，光具座各项技术指标均达到或超过了设计要求。