A LD-pumped OF-coupled NYAB self-frequency-doubling laser has been developed, in which the pumping laser beam from LD are focused into the NYAB crystal through a section of optical fiber. For the fundamental trasverse mode operation, the threshold pumping power is 14 mW and the output power of 0.531 μm green laser beam is 3.6 mW with an efficiency of 3% and the degree of polarization larger than 99.8%.