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All acousto-optic modulator laser system for a 12 m fountain-type dual-species atom interferometer

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Abstract

We design and implement a laser system for $^{85}{\rm Rb}$ and $^{87}{\rm Rb}$ dual-species atom interferometers based on acousto-optic frequency shift and tapered amplifier laser technologies. We use eight-pass acousto-optic modulators to generate repumping lasers for $^{85}{\rm Rb}$ and $^{87}{\rm Rb}$ atoms. The maximum frequency shift of the laser is 2.8 GHz, and the diffraction efficiency is higher than 20%. We use high-frequency acousto-optic modulators to generate the Raman lasers. This laser system uses only two seed lasers to provide the various frequencies required by $^{85}{\rm Rb}$ and $^{87}{\rm Rb}$ dual-species atom interferometers, which greatly improves laser usage. The laser system is applied in the equivalence principle test experiment using an $^{85}{\rm Rb}$ and $^{87}{\rm Rb}$ dual-species atom interferometer. The signal of atoms launched to 12 meters is successfully observed, and the resolution of gravity differential measurement is improved from $8 \times {10^{- 9}}$ g to $1 \times {10^{- 10}}\; {\rm g}$.

© 2021 Optical Society of America

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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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