en عمومى General پژوهشي Research In this paper, we report the experimental results of a pulsed flash lamped Nd:YAG laser at wavelength of 1064 nm and Qswitched by Cr4+:YAG solid state saturable absorber. We have obtained the output energy (E) and pulse-width ( p τ ) of this laser for various initial transmissions of this saturable absorber. Furthermore, the effect of reflectivity of the output coupler (R), diameter of the rod (d), and optical length of the cavity (l) on the laser output has been investigated. We have used the corner cube as a back mirror. We have obtained pulse-width 15ns with 31 mJ output energy. We have also analyzed this laser theoretically which agrees well with our corresponding experimental results. Q-switching, Passive Qswitching, Pulse width, Saturable Absorber, Cr4+:YAG. 41 48 http://ijop.ir/browse.php?a_code=A-10-178-1&slc_lang=en&sid=1 M. Erfani Jazi mary.erf.1362@gmail.com 10031947532846001112 10031947532846001112 Yes Dept. of Physics, University of Isfahan M. Dehghan Baghi 10031947532846001113 10031947532846001113 No Isfahan Electro Optic Industries (IOI) M. Hajimahmodzadeh 10031947532846001114 10031947532846001114 No Quantum Optics Group, University of Isfahan M. SoltanolkotabiM 10031947532846001115 10031947532846001115 No Quantum Optics Group, University of Isfahan