Optical noise sources of low Earth orbiter links (A05)

在项目A05中，我们调查了下一代重力任务(NGGM)的局部噪声源。在第一个资助期，我们重点研究了角抖动对激光干涉仪读数的交叉耦合，研究了耦合机理和抑制策略。在第二个资助期，我们将专注于对NGGM中的干涉测量进行详细的调查，比较几种可能的光学布局，然后在项目B06中建立一个。除了经典的制造和尺寸限制外，这种比较中的优值系数将例如取决于TTL的缓解，但也取决于杂散光耦合。因此，第二个重点将是开发和验证描述限幅相干杂散光束及其传输的方法。最后，目前所有模拟的精确度都受到实验中存在的激光波前特性的详细知识的限制。因此，我们将开发、测试和验证提高激光光束测量精度的方法。

In project A05, we investigate local noise sources for Next Generation Gravity Missions (NGGM). In the first funding period, we focused on the cross coupling of angular jitter to the laser interferometer readout, investigating coupling mechanisms and mitigation strategies. In the second funding period, we will focus on detailed investigations of the interferometry in an NGGM, comparing several possible optical layouts from which one will then be built in project B06. Besides classical manufacturing and dimensional constraints, the figure of merit in this comparison will for instance depend on TTL mitigation, but also on stray light coupling. Therefore, a second focus will be on the development and validation of methods for the description of clipped coherent stray beams and their propagation. Finally, the accuracy of all simulations is currently limited by the detailed knowledge of laser beam wavefront properties present in the experimental counterpart. Thus, we will develop, test and validate methods to improve the measurement accuracy of laser beams.