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