Reaching another star system within a human timescale requires traveling at a sizeable fraction of the speed of light. To achieve this, the Breakthrough Starshot program proposes a ground-based laser array to accelerate a gram-scale spacecraft through photon radiation pressure, requiring of order 100 GW of continuous wave optical power. The coherent combination of many lasers is one avenue to achieve a high optical power output. Here we present a photonic solution for optical phase sensing and control to enable the coherent combination of order ${10^8}$ individual lasers, including the ability to sense and compensate for atmospheric distortions, assuming the laser system is ground based.

中文翻译：

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光子星际推进的相位传感和控制的光子解决方案

在人类时标内达到另一个恒星系统需要以光速的相当大的一部分行进。为了实现这一目标，“突破性星散计划”提出了一种基于地面的激光器阵列，以通过光子辐射压力来加速克​​级航天器，这需要大约100 GW的连续波光功率。许多激光器的相干组合是实现高光功率输出的一种途径。在这里，我们提出了一种用于光相位传感和控制的光子解决方案，以实现假设量为{{10 ^ 8} $的单个激光器的相干组合，包括传感和补偿大气畸变的能力（假设激光系统是基于地面的）。