Integrated Raman laser system for cold atom horizontal gravity gradiometer

The invention relates to an integrated Raman laser system for a cold atom horizontal gravity gradiometer. The integrated Raman laser system comprises a laser unit, a first laser frequency shift unit, a laser amplification unit, a second laser frequency shift unit, a third laser frequency shift unit, an electro-optical modulation unit and a beam splitting and combining unit; the laser unit generates single-frequency laser and divides the single-frequency laser into two paths of laser with adjustable power to output the two paths of laser, wherein one path of laser is divided into two paths of laser again after passing through the laser amplification unit; one path of laser output by the laser amplification unit passes through the second laser frequency shift unit to generate Raman laser I, and the other path of laser passes through the third laser frequency shift unit and the electro-optical modulation unit to generate Raman laser II; the Raman laser I and the Raman laser II generate laser I, laser II, laser I