We evaluation the operation of 1064 nm electro –optically Q-switched Nd: YAG rod laser that is end
pumped by laser diode. The width of 400 ns, 350 ns and 250 ns were obtained at reflectivity of output coupler mirror
of 99, 98 and 95%, respectively and also observed the optical resonator ( L= 70-90 mm) and input optical power
(350-430 mW) is effective in the value of energy per pulse (6-23 ?J) and pulse width (250- 600 ns). The optimum
switching time of Q-switching is obtained at 750 ?s and the beam that a near-diffraction-limited quality.