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We report on a radially polarized and passively Q-switched Nd:YAG/Cr4 :YAG laser. The bulk Nd:YAG crystal is bonded with two undoped YAG crystal end caps to weaken the thermal lens e ect and thus, enhance the extraction of stored energy in the bulk gain material. In the absence of active water cooling, the average laser power reaches 383 mW with 33% slope e±ciency, and the laser pulse achieves 1.457-W peak power, 18.9-ns duration, and 13.9-kHz repetition rate with 97.6% polarization purity.