Abstract
Optical lattices for coherently manipulating ultracold atoms demand high-power, low-noise, narrow-line-width, and continuous-wave lasers. Here, we report the implementation of a 30W 532nm low-noise laser by second harmonic generation from a 1064nm fiber laser, which is capable to generate optical lattices for a quantum gas microscope of Rb87 atoms. The overall conversion efficiency is 59% at an input power of 51W with a lithium triborate crystal coupled to a ring cavity. The relative intensity noise of the output laser is suppressed to -120dBc/Hz in the range of 10Hz-100kHz with a high dynamic range of over 50dB, which is suitable for long-term trapping and coherent manipulation of the quantum gases.
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