Towards the LISA backlink: experiment design for comparing optical phase reference distribution systems
Towards the LISA backlink: experiment design for comparing optical phase reference distribution systems
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DOI：
10.1088/1361-6382/aaa879
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发表时间：
2018-04-26
影响因子：
3.5
通讯作者：
Heinzel, Gerhard
中科院分区：
文献类型：
--
作者：
Isleif, Katharina-Sophie;Bischof, Lea;Heinzel, Gerhard
LISA是一种拟议的天基激光干涉仪，通过测量自由漂浮的测试质量之间的距离来探测引力波，这些测试质量存放在三颗卫星中，位于一个三角形星座中，中间有激光链路。每颗卫星都包含两个光学工作台，它们通过移动的光学组件连接在一起，以补偿星座中的呼吸角。相位参考分配系统，也称为反向链路，在星内基准之间形成一条光双向路径。在这项工作中，我们讨论了在0.1 MHz到1 Hz的频段内，对于1064 nm波长，目标非互易度最大为2piµrad根赫兹(-1)，相当于1 PM根赫兹(-1)的相位参考实现。一个相位基准使用导向自由光束连接，另一个相位基准使用光纤和额外的激光频率。这些实施的噪声特性将在单个干涉设置中与先前成功测试的直接光纤连接进行比较。我们展示了这种干涉仪的设计，通过光学模拟包括鬼光束分析、组件对准和噪声估计。首先给出了两个同向旋转+/-1度光学装置之间的自由光束激光链路的实验结果。实验表明，在1 MHz下旋转小于10-4K根赫兹(-1)的情况下，自由光束转向镜的运行时间超过1周，具有足够的热稳定性。
LISA is a proposed space-based laser interferometer detecting gravitational waves by measuring distances between free-floating test masses housed in three satellites in a triangular constellation with laser links in-between. Each satellite contains two optical benches that are articulated by moving optical subassemblies for compensating the breathing angle in the constellation. The phase reference distribution system, also known as backlink, forms an optical bi-directional path between the intra-satellite benches.In this work we discuss phase reference implementations with a target non-reciprocity of at most 2 pi mu rad root Hz(-1), equivalent to 1 pm root Hz(-1) for a wavelength of 1064 nm in the frequency band from 0.1 mHz to 1 Hz. One phase reference uses a steered free beam connection, the other one a fiber together with additional laser frequencies. The noise characteristics of these implementations will be compared in a single interferometric set-up with a previously successfully tested direct fiber connection. We show the design of this interferometer created by optical simulations including ghost beam analysis, component alignment and noise estimation. First experimental results of a free beam laser link between two optical set-ups that are co-rotating by +/- 1 degrees are presented. This experiment demonstrates sufficient thermal stability during rotation of less than 10-4 K root Hz(-1) at 1 mHz and operation of the free beam steering mirror control over more than 1 week.