By utilizing the principle of polarization-selective grating mirrors,a 35-layer circular grating mirror,with1000 nm period and 70 nm groove depth,has been designed and fabricated.The grating mirror is placed in a laser diode pumped Nd:YAG rod laser system as the cavity mirror.After optimizing the laser system,we get a radially polarized beam,of which the degree of radial polarization and the power are 97% and 13.4 W,respectively.