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

We design and implement a laser system for ⁸⁵Rb and ⁸⁷Rb 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 ⁸⁵Rb and ⁸⁷Rb 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 ⁸⁵Rb and ⁸⁷Rb dual-species atom interferometers, which greatly improves laser usage. The laser system is applied in the equivalence principle test experiment using an ⁸⁵Rb and ⁸⁷Rb 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 8×10^-9 g to 1×10^-10g.