精密干涉测量中的几何倾斜-长度耦合：机理和解析描述
Geometric tilt-to-length coupling in precision interferometry: mechanisms and analytical descriptions
摘要：
倾斜-长度耦合是用于将角度或横向抖动交叉耦合到干涉相位信号中的技术术语。它是精密干涉仪中的一个重要噪声源，其来源于光程长度的变化或波前和削波效应。在本文中，我们专注于几何TTL耦合，并将其归类为一些不同的机制，我们给出了解析表达式。然后，我们表明，这种几何描述并不总是足以预测的TTL耦合噪声内的干涉仪。因此，我们讨论如何理解的几何效应允许TTL噪声降低已经通过智能设计的选择。此外，它们还可用于抵消系统中的总测量TTL噪声。所介绍的内容适用于各种各样的精密干涉仪，包括像LISA这样的空间引力波探测器。
英文摘要：
Tilt-to-length coupling is a technical term for the cross-coupling of angular or lateral jitter into an interferometric phase signal. It is an important noise source in precision interferometers and originates either from changes in the optical path lengths or from wavefront and clipping effects. Within this paper, we focus on geometric TTL coupling and categorize it into a number of different mechanisms for which we give analytic expressions. We then show that this geometric description is not always sufficient to predict the TTL coupling noise within an interferometer. We, therefore, discuss how understanding the geometric effects allows TTL noise reduction already by smart design choices. Additionally, they can be used to counteract the total measured TTL noise in a system. The presented content applies to a large variety of precision interferometers, including space gravitational wave detectors like LISA.
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