用于未来重力任务激光测距仪器的同轴光学平台
On-axis Optical Bench for Laser Ranging Instruments in future gravity missions
AI总结：
本文面向未来重力任务设计下一代激光测距同轴光学平台，通过提升接收光功率与发射光束发散角支持更长干涉臂并降低激光功率需求，并以仿真和热分析验证其性能与轨道温度稳健性。
摘要：
重力恢复与气候实验后续任务（GRACE Follow-On）上搭载的激光测距干涉仪证明了干涉传感器以亚纳米精度进行星间长度跟踪的可行性，为空间激光干涉测量确立了重要里程碑，并使人们普遍预期未来重力任务将采用外差激光干涉测量进行星间测距。本文提出了一种用于下一代激光测距的同轴光学平台设计，该设计提高了接收光功率和发射光束发散角，从而能够实现更长的干涉仪臂长，并放宽激光组件的光功率要求。所有设计功能和要求均通过计算机仿真进行了验证。此外，还开展了热分析，以研究所提出的光学平台对轨道上温度波动的稳健性。
英文摘要：
The Laser Ranging Interferometer onboard the Gravity Recovery and Climate Experiment Follow-On mission proved the feasibility of an interferometric sensor for inter-satellite length tracking with sub-nanometer precision, establishing an important milestone for space laser interferometry and the general expectation that future gravity missions will employ heterodyne laser interferometry for satellite-to-satellite ranging. In this paper we present the design of an on-axis optical bench for next-generation laser ranging which enhances the received optical power and the transmit beam divergence, enabling longer interferometer arms and relaxing the optical power requirement of the laser assembly. All design functionalities and requirements are verified by means of computer simulations. A thermal analysis is carried out to investigate the robustness of the proposed optical bench to the temperature fluctuations found in orbit.
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