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An innovative electro-optic (EO) Q-switch technology in 1064nm and 1319nm dual-wavelength operation of a Nd∶YAG laser is illustrated.Output energy of 4.6mJ and pulse width of 400ns for 1064nm and output energy of 8.7mJ and pulse width of 80ns for 1319nm are achieved simultaneously at the repetition rate of 1 Hz and pumping voltage of 750 V by using this bias voltage electro-optic Q-switched-technology when the voltage on LiNbO3 crystal is 2254 V.The strong line of 1064 nm in Q-switched operation is inhibited efficiently.