# On fine alignment of transmitted beams for TianQin with far-field wavefront error

## TL;DR

This paper proposes an efficient beam alignment strategy for TianQin, a space-based gravitational wave detector, that accurately aligns transmitted laser beams by maximizing received intensity, accounting for wavefront errors and small point-ahead angles.

## Contribution

It introduces a novel alignment method based on intensity maximization and quatrefoil scanning, improving precision in beam alignment for TianQin.

## Key findings

- Alignment within 20 nrad achieved in simulations
- Tilt-to-length coupling meets requirements with $\lambda/40$ RMS aberration
- Strategy effectively compensates for far-field wavefront errors

## Abstract

TianQin is a proposed space-based gravitational wave detector mission that employs inter-satellite laser interferometry. Suppressing measurement noise and achieving high sensitivity require accurate alignment of multiple onboard interferometers after laser link acquisition. However, due to huge armlengths and varying point-ahead angles, the fine alignment of the transmitted beams can be particularly challenging, which needs to take into account both received laser power and far-field wavefront errors. To tackle this issue for TianQin which has small point-ahead angle variations, we propose an efficient alignment strategy that relies on finding the maximum-intensity direction of the transmitted beam as the alignment reference. The direction can be estimated through a quatrefoil scan of the local transmitted beam and the corresponding intensity measurement from the remote satellite. Under TianQin's fixed-value compensation of the point-ahead angles, simulation results reveal that the proposed strategy is capable of aligning the transmitted beams within 20 nrad from the mean value of the point-ahead angles, while the tilt-to-length coupling associated with far-field wavefront error can meet the requirement given a transmitted beam aberration of $\lambda/40$ RMS.