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We report on an injection seeded 1 kHz single frequency pulsed Nd∶YAG ring laser with pulse energy of 5.2mJ and pulse width of 9.9 ns.The ramp-fire technique is used to maintain single frequency operation and the cavity length is modulated by an intracavity RbTiOPO4 (RTP) crystal.The frequency stability (rms) of the output pulse is 1.99 MHz over 1 min and the linewidth is 64 MHz.