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We report on the realization of a high-power, ultranarrow-linewidth, andfrequency-locked 532~nm laser system. The laser system consists of single-passand intra-cavity second harmonic generation of a continuous-wave Ytterbiumdoped fiber laser at 1064~nm in the nonlinear crystal of periodically poledlithium niobate and lithium triborate, respectively. With 47~W infrared input,30~W green laser is generated through the type I critical phase matching in theintracavity lithium triborate crystal. The laser linewidth is measured to be onthe order of sub-kHz, which is achieved by simultaneously locking thesingle-pass frequency doubling output onto the iodine absorption line R69(36-1) at 532~nm. Furthermore, the phase locking between the laser system andanother slave 1064~nm laser is demonstrated with relative frequency tunabilitybeing up to 10~GHz. Our results completely satisfy the requirements of 532~nmlaser for quantum simulation with ultracold atoms.

A 30 W, sub-kHz frequency-locked laser at 532 nm