摘要： We developed an intracavity frequency-doubled acousto-optic Q-switched Nd:YAG laser generating * 260 W of average green power using two identical diode-pumped gain modules with ?vefold pumping symmetry in a simple two mirror linear cavity con?guration. The corresponding optical to optical conversion ef?ciency was estimated to be * 16.8%. At maximum output power, individual green pulse duration (FWHM) was measured to be * 73 ns with a pulse repetition rate of 18 kHz. The output average green power was highly stable with measured ?uctuation in average green power ± 0.83 W over 5 h of continuous operation. The jitter in pulse delay time and pulse to pulse amplitude ?uctuation was measured to be within ± 4.25 ns and ± 5%, respectively. The maximum beam drift recorded at 5 m distance away from the laser system was * 14 micron corresponding to beam pointing stability of ± 2.8 micro-rad.