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Modular-assembled laser system for a long-baseline atom interferometer

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Abstract

The Zhaoshan long-baseline Atom Interferometer Gravitation Antenna (ZAIGA) is a new, to the best of our knowledge, type of large-scale atom interferometer facility under construction for the study of gravitation and related problems. To meet the different requirements of the laser system for the atom interferometer using various atoms (including $^{85}{\rm{Rb}}$, $^{87}{\rm{Rb}}$, $^{87}{\rm{Sr}}$, and $^{88}{\rm{Sr}}$), we design and implement a modular assembled laser system. By dividing the laser system into different basic units according to their functions and modularizing each unit, the laser system is made highly scalable while being compact and stable. Its intensity stability is better than 0.1% in ${{1}}{{{0}}^2}\,\,\rm s$ and 0.5% in ${{1}}{{{0}}^4}\;{\rm{s}}$. We test the performance of the laser system with two experimental systems, i.e., an $^{85}{\rm{Rb}}- {^{87}}{\rm{Rb}}$ dual-species ultracold atom source and an $^{85}{\rm{Rb}}$ atom interferometer. The $^{85}{\rm{Rb}}- {^{87}}{\rm{Rb}}$ dual-species magneto-optical trap and the $^{85}{\rm{Rb}}$ atom interference fringes are realized by using this laser system, indicating that its technical performance can meet the major experimental requirements.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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