A 1-kHz Single Frequency Nd:YAG Ring Laser by Injection Seeding

We report on an injection seeded 1 kHz single frequency pulsed Nd:YAG ring laser with pulse energy of 5.2 mJ 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 RbTiOPO_4(RTP) crystal. The frequency stability(rms) of the output pulse is 1.99 MHz over 1 min and the linewidth is 64 MHz.